공부하다가 몰라서..혹시 아시는 분 좀 알려주세요..

Promotion candidates should present (    ) they like to prove their performance and commitment to the company are strong.
A) wherever
B)however
C)whatever
D)whoever

문제 답도 잘모르겟고요...구조가 어떻게 나뉘는 지도 모르겟어요..ㅠㅠ 도와주세요...