The answer is A because theres nothing else to modify.
Being a role model means being an adult figure to others. You have a responsibility if someone looks adores you and want to be like you. Children especially look up to their role model, such as their parents. They have to set a good example for them because the kids have someone that want to be like.
Answer:
must,have,do not,cannot, have to
Well the answer b and c are both right but I would pick b
