Question

プリン(っ ॑꒳ ॑c)ﾝﾏｯ!!

(6)の問題が分かりません！
boysが先行詞で目的格だと思ったんですけど違いました！
答えは②です！
どなたか解説お願いします！

1 who
(6) She likes boys (
1 whoever
3 that
4 whom
2 whose
) she thinks have respect for their parents.
she
2 who
(7) I don't know the name of the man (
whom
3 of whom
) I spoke on the phone.

関係代名詞