which of the folllwing is an authority on a topic A people whose job it is to study the topic B people who are paid to endorse a product related to the topic C people who like to share their opinions on the topic D people who are good writers on the topic
The answer is A.) People who's job it is to study the topic. For example, an authority on a biology topic would be a Biologist; someone who studies biology as a career.
