Trivial: of little value or importance

Cardinal: of the greatest importance; fundamental

Fundamental: forming a necessary base or core; of central importance

Scanty: small or insufficient in quantity or amount

Hence, option A is the correct answer.

Confluence = the junction of two rivers, especially rivers of approximately equal width.

Strait = a narrow passage of water connecting two seas or two other large areas of water.

Delta = a triangular tract of sediment deposited at the mouth of a river, typically where it diverges into several outlets.

Estuary = the tidal mouth of a large river, where the tide meets the stream.

Hence, option A is the correct answer.

Aisle = a passage between rows of seats in a building such as a church or theatre, an aircraft, or train.

Auditorium = the part of a theatre, concert hall, or other public building in which the audience sits.

Gymnasium = a room or building equipped for gymnastics, games, and other physical exercise.

Hanger = a shaped piece of wood, plastic, or metal with a hook at the top, from which clothes may be hung in order to keep them in shape.

Hence, option B is the correct answer.

Vegetarian = a person who does not eat meat or fish, and sometimes other animal products, especially for moral, religious, or health reasons

Non- vegetarian = a person whose diet includes meat

Drunkard = a person who is habitually drunk

Teetotaler = a person who never drinks alcohol

Hence, option D is the correct answer.

Incredible = Impossible to believe

Gullible = easily persuaded to believe something; credulous

Fraud = wrongful or criminal deception intended to result in financial or personal gain

Native = a person born in a specified place or associated with a place by birth, whether subsequently resident there or not

Hence, option B is the correct answer.

Garden = a piece of land where flowers and other plants are grown

Aviary = a place where birds are kept

Yard = an area outside a building, usually with a hard surface and a wall or fence around it

Nursery = a place where plants are grown for sale

Hence, option D is the correct answer.

Congenital = present at birth but not necessarily hereditary; acquired during foetal development

Habitual = commonly used or practised; usual

Chronic = being long-lasting and recurrent or characterized by long suffering

Anomaly = deviation from the normal or common order or form or rule

Hence, option A is the correct answer.

Programme = a plan of activities to be done.

Agenda = a list of items to be discussed at a formal meeting.

Topic = subject that is discussed, written about or studied.

Timetable = a detailed plan that shows the times at which something happens.

Hence, option B is the correct answer.

Curator = a keeper or custodian of a museum or other collection.

Calligrapher = a professional copyist or engrosser.

Cartographer = a person who draws or produces maps.

Choreographer = someone who invents the movements for a ballet or other dance and tells the dancers how to perform them.

Hence, option C is the correct answer.

Omnivorous = (of an animal or person) feeding on a variety of food of both plant and animal origin.

Herbivorous = (of an animal) feeding on plants.

Insectivorous = (of an animal) feeding on insects, worms, and other invertebrates.

Carnivorous = (of an animal) feeding on other animals.

Hence, option A is the correct answer.