Compared with boys, girls tend to spend
a) more time in competitive sports.
b) less time in clubs
c) less time engaging in social relationships.
d)more time with friends.

The correct answer is D.

Girls in general tend to spend more time with friends. This isn't to say that boys don't spend a lot of time with their friends but girls tend to engage more in their social relationships, whereas boys spend more time in competitive sports, more time in clubs and less time engaging in social relationships.

not always but somethings can be reproduced in a laboratory.