一道高中英语单选题，求解释～～～

这一句是定语从句，定从中的介词in，on等等位置可前可后。定语从句中in which=where.which指代先行词shop,in which就是in the shop.之所以用which是为了避免再次出现shop. In which to produce the workings of his own hands这个部分是充当定语的从句来修饰shop的。翻译：法兰克的梦想是拥有他自己的商店，在(in)这个商店(which)里（in the shop= in which）能生产他自己的手工品。
Frank's dream was to have his own shop in which to produce the workings of his own hands.=Frank's dream was to have his own shop where to produce the workings of his own hands.
tip:介词后不加that,但可以加which。

答案为B。
in which to produce the workings of his own hands
相当于：in which he could produce the workings of his own hands.
类似的：I wanted to borrow a pen with which to write a letter.
相当于：I wanted to borow a pen with which I could write a letter.

produce the workings of his own hands生产自己的手工作品
词组应该应该这样排列produce the workings of his own hands in the shop
现在the shop 做为先行词放在前面了，所以就变成了the shop in which to produce the workings of his own hands.

in which 相当于where.充当地点状语。