To my delight, there was my purse, in the back seat of the taxi, ________ the driver couldn’t possib

To my delight, there was my purse, in the back seat of the taxi, ________ the driver couldn’t possibly see it before．

A.that

B.which

C.where

D.when

答案及解析： C

先行词为the back seat of the taxi，由先行词可确定关系词应为where。