Question

whose career is flourishing? a comedian constantly booed by his audience a basketball player at the top of his game a police officer ready for retirement a teacher just starting out

Explanation:

A career is flourishing when one is highly successful and at the peak of their performance. A comedian booed by the audience is not successful. A police officer ready for retirement is likely winding down. A teacher just starting out is in the early stages. A basketball player at the top of his game is highly successful and performing at a peak level.

Answer:

a basketball player at the top of his game