Verified Answer :

I think it is C, Because to entertain you hold someones attention

Answer:

The exact meaning of the word entertain is C. to hold together  considering its prefix.

Explanation:

If the exact meaning of "enter is: among. The meaning of the word entertain is to hold together because among is a concept to describe the action of being together or to be part of a group. Therefore, entertainment is the concept of keeping a group together. And that is the correct answer because all the rest say the exact opposite thing.