There's so many kinds of tape recorder on sale that I can't make up my mind ________ to bu

There's so many kinds of tape recorder on sale that I can't make up my mind ________ to buy．

A.what

B.which

C.how

D.where

答案及解析： B

解析：

which意思是“哪一个(些)”，指从众多供出售的录音机中买一台。