The statement that best explains the student observation is water is not a smooth surface after the rock is dropped in the pond.
An observation is refers to a process where someone observes a subject ongoing behavior in a natural situation.
Here, the observation of the situation takes places immediately when the student drops the stone into the water.
Hence, the Option B is correct because the statement that best explains the student observation is water is not a smooth surface after the rock is dropped in the pond.
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