[单选题]
As a rock sinks deeper ftrr8iwbk9 xw*6upmuz95 8* qand deeper into water of constant density, what happenjq.l 018r (qenqo krq0s to the buoyant force on i.1(lqeo 8r0q kr0njq qt?
A. It increases.
B. It remains constant.
C. It decreases.
D. It may increase or decrease, depending on the shape of the rock.
