Dual = consisting of two parts, elements, or aspects.

Duel = combat between two persons specifically

Duo = a pair of people or things, especially in music or entertainment

Duet = a performance by two singers, instrumentalists, or dancers.

Hence, option B is the correct answer.

Soliloquy = an act of speaking one's thoughts aloud when by oneself or regardless of any hearers, especially by a character in a play.

Solitary = done or existing alone.

Eloquent = fluent or persuasive in speaking or writing.

Dialogue = a conversation between two or more people as a feature of a book, play, or film.

Hence, option A is the correct answer.

Let us understand the meaning of the given words :-

Forest = a large area of land covered with trees and plants, usually larger than a wood, or the trees and plants themselves.

Park = a large area of land with grass and trees which is maintained for the pleasure of the public.

Meadow = an area of land with grass and other wild plants in it.

Garden = a piece of land, usually in a yard next to a house, where you grow flowers and vegetables

Meadow is a natural grassland, used for grazing animals.

Hence, option C is the correct answer. 

Let’s learn the meaning of the given words:

Herbicide: a substance that is toxic to plants, used to destroy unwanted vegetation

Suicide: the act of intentionally causing one's own death

Pesticide: a substance used for destroying insects or other organisms harmful to cultivated plants or to animals (pests)

Patricide: the killing of one's father

Hence, analyzing all the meanings, option C seems to be correct.

Let’s learn the meaning of the given words:

Fleet: a group of ships sailing together, engaged in the same activity, or under the same ownership

Bevy: a group of roe deer, quails, or larks

Suite: a group of people in attendance on a monarch or other person of high rank

Army: an organized military force equipped for fighting on land

Hence option A is correct.

Let’s understand the meaning of the given words:

Director = one who manages or controls a company or organization

Hypocrite = one who pretends to be what he is not

Creator = one who makes or produces something new

Acrobat = one who performs difficult movements of the body, especially in a circus

Hence, option B is the correct answer.

Convent = a place where nuns live and work

Dormitory = a large room containing many beds

Hostel = a place where people can stay free or cheaply for short time

Quarter = a house or other place that has been provided especially for servants or soldiers, to live in

Hence, option A is the correct answer

Journal = a newspaper or magazine that deals with a particular subject or professional activity.

Directory = a book or website listing individuals or organizations alphabetically or thematically with details such as names, addresses, and telephone numbers.

Dictionary = a book or electronic resource that lists the words of a language (typically in alphabetical order) and gives their meaning, or gives the equivalent words in a different language, often also providing information about pronunciation, origin, and usage.

Diary = a book in which one keeps a daily record of events and experiences.

Hence, option B is the correct answer.

Orator- a public speaker, especially one who is eloquent or skilled

Altruist- a person who cares about others and helps them despite not gaining anything by doing this

Librarian- a person in charge of or assisting in a library

Bibliophile- a person who collects or has a great love of books

Hence, option D is the correct answer.

Fratricide = an act of murdering one’s brother.

Regicide = an act of murdering a king.

Genocide = an act of killing a group of people.

Patricide = an act of killing one’s father.

Hence, option A is the correct answer.