先輩に作文を直して___。
Q. Which ending expresses 'I had my senior correct my essay'?
Translation
I had my senior correct my essay.
Explanation
〜てもらう means the subject receives the benefit of someone's action, with the doer marked by に: 先輩に直してもらいました. 〜てくれる would need the senior as subject (先輩が直してくれました).