The service in the hotel is very poor ,it's __ hotel that yo

The service in the hotel is very poor ,it's __ hotel that you can imagine.
The service in the hotel is very poor ,it's __ hotel that you can imagineA.aworst B.the worst C.the worse D.a worse为什么选B 不是A?是不是因为 that you can imagine 有范围限制 所以要用冠词"the"?