[单选题]
As a rock sinks deeper and deeperbc zyv6r2357 ecm-p lz into water of constant density, what happe13i jv 5si .yscqhd34pns to the buoyant force on sdic3 sp j3 41.y5vqihit?
A. It increases.
B. It remains constant.
C. It decreases.
D. It may increase or decrease, depending on the shape of the rock.
