Melissa finished learning about how some employers exploit children by making them work for little money. She is sad and

Melissa finished learning about how some employers exploit children by making them work for little money. She is sad and wants to find a way to make their lives better.

In this context, what is the meaning of the homograph exploit?
a
To improve someone’s life
b
To marvel at someone’s tricks
c
To use someone unfairly
d
To wish to someone