Trouper vs. Trooper

Which is the best answer to address the blank in the sentence below.

"She stayed the entire time despite having a headache. She’s a real __________."

1. trouper

2. trooper

3. Both are correct.

4. Neither is correct.

The best answer is "trouper," meaning a member of a troupe, or company of performers, that recognize that "the show must go on" despite adversity. A "trooper" is properly defined as a state police officer, cavalry soldier or paratrooper.