To Beth and Kyle.
Both of you have very good reasonings, but the answer is
C: The water level became lower.
Reasoning: While the bricks are in the boat, the buoyant force supports the boat, student, and bricks. When the bricks are thrown into the water and sink to the bottom of the pool, the buoyant force supports mainly the boat and student, since the bricks are now supported by the bottom of the pool. (There is a small buoyant force on the brick due to the volume of water they displace, but it small compared to the weight of the bricks.) Since the buoyant force supports less weight with the bricks in the pool, less volume of water is displaced, and the pool water level decreases.
ah, hehehehe. ok. That makes sense!
Pero wow, that's quite a huge pool that accomodates a boat, isn't it?
Kyle, I guess we'll do our assignments more next time
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