If the current allocation of resources in the market for hammers is inefficient, then it must be the case that

A、producer surplus exceeds consumer surplus in the market for hammers.;

B、consumer surplus exceeds producer surplus in the market for hammers;

C、the sum of consumer surplus and producer surplus could be increased by moving to a different allocation of resources.;

D、the costs that sellers of hammers are incurring could be reduced by moving to a different allocation of resources.