[单选题]
A steel ball sinks in water but floats in a pool ,pb-0zu1s(6h3zvoht n 5szcc of 61d;f. au,kvxa svj1n mercury. Where is the buoyant force on the ball 1a6vdj 1uk,nx v;fas .greater?
A. floating on the mercury
B. submerged in the water
C. It is the same in both cases.
D. cannot be determined from the information given
