Why should genealogical topics be avoided in a conversation? （）

Why should genealogical topics be avoided in a conversation? （）

A.Because your conversation partner has more famous forebears than you.

B.Because your conversation partner may think you are trying to pick out one famous forebear to show off.

C.Because the ancestors of your conversation partner range from princes to bums.

D.Because your conversation partner has a shameful family history.

正确答案是B