84. Assume water is an incompressible fluid. If you double the pressure on the surface of a can of water, the buoyant force on a stone placed in that water will_________ .
(A) double.
(B) not change.
(C) increase, but not double.
(D) decrease, but not by one-half.

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統計： A(0), B(2), C(0), D(1), E(0) #2319901