If I want to say: My friend is the fastest runner in the school.
Should I say IN the school or OF de school

What is the correct way of writing the following sentence? you’re headed for the big time kim said. a. “you’re headed for the big time,” kim said. b. your headed for the big time, kim said. c. you’re headed for the big time, kim said. d. “you’re headed for the big time” kim said