Answer:
ABCDEFGHIJKLMNOPQRSTUVWXYZ
Explanation:
They explain that everyone struggles to be happy, borrowing happiness from other people, and that even the earth itself has to borrow happiness.
Well, since your thesis statement is supposed to be the last sentence of the first paragraph, your introduction should precede it.
The group should agree on a consensus; have a common ground.
In other words, the answer should be B.