I believe the answer you're looking for is C. Hope this helps!
They can make groups and support people in the community who have been through human trafficking or people who are going through human trafficking right now.
It's A. Because a simile is a fugue of speech involving the comparison of one thing to another thing of a different kind.
The answer to your question is,
Which type of volunteer work is the most time consuming?
-Mabel <3