This is the best film__has ever madeA.whichB.thatwhy we choose

This is the best film__has ever madeA.whichB.thatwhy we choose
This is the best film__has ever made
A.which
B.that
why we choose

This is the best film__has ever madeA.whichB.thatwhy we choose
film是先行词,当先行词为最高级形式时,只能用that

that.
最高级的应该是这样吧..