A Cubical Block of Stone Is Lowered at a Steady

A cubical block of stone is lowered at a steady rate into the ocean by a crane,always keeping the top and bottom faces horizontal.Which one of the following graphs best describes the buoyant force B exerted on this block by the water as a function of time t if the block just enters the water at time t = 0 s?

A)

B)

C)

D)

E)