15.
(A) by whom
(B) to which
(C) in that
(D) for what

Scientists also report that the category 15___ the person belongs (family, close friends, etc.) is far more influential in causing a mix-up than any phonetic similarity between names. Names that sound alike do not usually trigger the mix-up.
     Isn’t it great to know that when you call others by the wrong name, it is evidence of your love for them all?

15.(B)
(A) by whom通過誰

(B) to which到那個
(C) in that 在那裡面
(D) for what .為了什麼 

#influential有影響的

#phoneticKK[foˋnɛtɪk]語音的；語音學的

#trigger能引起反應的

#evidence證據