Big Lobster Sells Lobster and Fish, and So Too Does

Big Lobster sells lobster and fish, and so too does H Salt. If Big Lobster's opportunity cost of preparing lobster exceeds H Salt's opportunity cost, then all the following are true EXCEPT
)

A) they will both gain if Big Lobster sells fish and H Salt sells lobster.
B) Big Lobster has a comparative advantage in lobster.
C) H Salt has a comparative advantage in lobster.
D) H Salt doesn't have a comparative advantage in cooking fish.