英文Collectives

(1) I don't think the film is worth seeing. ______ , I think it's horrible.

A. On the one hand
B. On th centrary
C. On the other hand
D. Consequently

(2) Stewart is not very smart. _______ ,he is very honest.

A. To the contrary
B. On the contrary
C. Similarly
D. However

老師說，(1) 的答案是B，(2)的答案是D。
根據(1)，On th centrary有However的意思，
但是為什麼(2) 的答案不可以是B？