[单选题]
As a rock sinks deeper ando3 -r17tehjqj deeper into w ,a7pcysq6t2iy59n r8fpb.naater of constant density, what happens to the buoyant force,y8b 7sarntfc .ppn56a 2yq i9 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.
