[单选题]
A 10-kg piece of alum 2 /fyljr*0(enumflxb4 t fw)a )5d4hminum sits at the bottom of a lake, r ikp2:u bbma*+ight next to a 10-kg piece of lead. Which has the greater buoy:bbpim2a* ku+ant force on it?
A. the aluminum
B. the lead
C. Both have the same buoyant force.
D. cannot be determined without knowing their volumes
