Whichinferenceinthebracketsofthefollowingsentencesisapresupposit

Whichinferenceinthebracketsofthefollowingsentencesisapresupposition

A.Ede caught a trout. (Ede caught a fish.)

B.Don' t sit on Carol' s bed. (Carol has a bed.)

C.This blimp is over the house. (The house is under the blimp.)

D.Coffee would keep me awake all night. (I don' t want coffee.)

正确答案是B