[单选题]
A steel ball sinks in watn5vjsf c1 tmi0k.g /j)er but floats in a pool o8yc;l4893 a igfcn8 iy)gfvktvmaj9 ,f mercury. Where is the buoyant force on the batck9,) ; yi883 4yn l ffi8cvggm9vjaall 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