若按照强调句型去理解，就是：It was in the bookstore _that__ we often bought books.然后把此句变为非强调的为：we often bought books in the bookstore.这样以来，就不是对Where did you see her yesterday?的回答了，所以说A是错误的。
which we often bought books是bookstore的定语从句。
C which引导的定语从句。选that引导强调句结构没错。但是去掉it was...that就答非所问了。你看一下
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