Judge the following sentence according to the criteria given below. Grains are easier to move in water than air because the grains effectively weigh less in water than in air
A) The assertion and the reason are both correct, and the reason is valid.
B) The assertion and the reason are both correct, but the reason is invalid.
C) The assertion is correct but the reason is incorrect.
D) The assertion is incorrect but the reason is correct.
E) Both the assertion and the reason are incorrect.
Answer: A
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