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보라색 실전 2회 청해 파트 질문ㅇ인데요!
29번에서

M: I'm surprised Trent defended Lynn against that bully.

W: Why wouldn't he? She's his sister.

M: I had the impression they weren't clsoe.

W:

(b)He's obligated to stand up for a sibling

(d) It's a bond found in any family.

여기서 b와 d 중에 정답을 어떻게 골라내면 될까요? 자세한 설명 부탁드립니다 ㅠㅠ