he told __he believe what his father said.A.if B.whether C./

那就对了
he told me__he believe what his father said.
A.if B.whether C./ D.what
答案：C
解析：told是及物动词,所以后面必须有宾语,而且此句中有me,那么就应该是tell sb.sth.（告诉某人某事）的结构,所以后面整个一句就应该是told的第二个宾语.
因为后面he believe what his father said是一个完整的句子,what是要在句子里做成分的,比如后面这半句里面的what,做的就是said的宾语.

选D吧 句意：他告诉我，他相信他的父亲说