Answer:
I think the answer is D (compound)
The answer is A. <span>Individual productivity is necessary for group productivity. This is because if an individual works for the project, it will be productive for the company or group especially when all individuals work for their tasks.</span>
The answer you're looking for <u><em>D. Definition clue</em></u>. This is the correct answer because in the provided sentence we read "People who are gregarious, or very friendly and sociable, always have something fun to do. " Gregarious is what we are defining, and right after the word we find "or very friendly and sociable" which explains what gregarious means.
<em>Sorry if i'm late, I got to this question as fast as I could! That's the best explanation for this answer I have to offer, but hopefully it explains why I chose that answer. Have a great day! </em>