Statement:
People of all ages have found us good people to grow with.
Assumptions:
I. People want to grow.
II. We are good people.
Answer: A
As in the statement the author says that there are people who are looking for good people to grow with, that means people want to grow. Hence, I is implicit.
According to the statement, people found these people to be good, but not the author by himself. Hence, II is not implicit.