The correct answer is option 2 i.e. Aborigines.

• Aborigines: Refers to the original or native inhabitants of a land or country.
  Example: The Aborigines of Australia have a rich cultural history.

• Immigrants: Refers to people who move to a country from another to settle there.

• Residents: Refers to individuals who live in a specific place but does not imply being the original inhabitants.

• Slaves: Refers to people who are forced to work without freedom.

As the chosen option best expresses the meaning of the given group of words it will be correct.

The correct answer is option 4 i.e. Dermatologist.

• Dermatologist - a medical practitioner qualified to diagnose and treat skin disorders.
• Geologist-an expert in or student of geology.
• Cardiologist-a doctor who specializes in the study or treatment of heart diseases and heart abnormalities.
• Radiologist-a person who uses X-rays or other high-energy radiation, especially a doctor specializing in radiology.

As the chosen option best expresses the meaning of the given group of words it will be correct.

The correct answer is option 2 i.e. Versatile.

1. Versatile-able to adapt or be adapted to many different functions or activities.
2. Surrogate-a substitute, especially a person deputizing for another in a specific role or office.
3. Expert-a person who is very knowledgeable about or skilful in a particular area.
4. Deputy-a person who is appointed to undertake the duties of a superior in the superior's absence.

As the chosen option best expresses the meaning of the given group of words it will be correct.

The correct answer is option 2 i.e. chagrin.

Much to someone’s surprise/amazement/annoyance/embarrassment - used for saying that something happens that surprises, annoys someone a lot.

1. Chagrin (noun)- strong feelings of embarrassment.
2. Approbation- approval or praise.
3. Oblivion- the state of being unaware or unconscious of what is happening around one. It also means the state of being forgotten, especially by the public, or obscurity.

The correct answer is option 3 i.e. atavism.

Atavism (noun): A reappearance of an earlier characteristic; throwback.

It is a return to a previous way of doing, saying, or seeing things. It can be casual, like wearing retro clothing and listening to vinyl records, or committed, like living in a straw hut without electricity.

The correct answer is option 1 i.e. meticulous.

Explanation: "Meticulous" means showing great attention to detail. In this case, the economist's analysis was thorough, precise, and provided valuable information for investors.

The correct answer is option 2 i.e. arduos.

The incorrectly spelled word is "arduos." The correct spelling is "arduous." 

The word "arduous" means something that is very difficult, strenuous, or requires a lot of effort.

The correct answer is Option 3 i.e. Contamporary.

The correct spelling of the word will be-

Contemporary- of the same age.

The chosen option is incorrectly spelt hence, it will be the correct answer.

The correct answer is Option 2 i.e. Camoflage.

The correct spelling of the chosen word will be-

Camouflage- to disguise.

The correct answer is Option 3 i.e. Encyclopadia.

The correct spelling is : Encyclopedia.

Meaning of other words is:

1. Encyclopedia- a book or set of books giving information on many subjects or on many aspects of one subject and typically arranged alphabetically.
2. Equivocation- the use of ambiguous language to conceal the truth or to avoid committing oneself; prevarication.
3. Esteem- respect and admiration.
4. Equanimous- calm and composed.