[单选题]
As a rock sinks deeper and deeper into water of constant dex0b6c,jmm-a q9(z qc znsit1u-nzc45ovb pf1 8skwf.cu o,y, what happens t n c18o-5f1spwzkb fu.u4ovc,o the buoyant force on it?
A. It increases.
B. It remains constant.
C. It decreases.
D. It may increase or decrease, depending on the shape of the rock.
