帮我做一道英语题呗~~~

Question

Fox was advised to give the assignment to _______ he believed had a strong sense of responsibility.
a. whom b. whomever c. whoever d. that
答案c
请帮我翻译一下，再讲一下句子结构，解释一下答案。谢谢啊~~

Answer 1

福克斯被建议转让给他认为有强烈的责任感的人。