Use reasoning to lead to the answer of the following question:
Billy found it easy to divide 9, because 9 was a what of 3?\nOptions:\n- multiply\n- multiple\n- unite\n- multiplication\n- multiple
 Reasoning process:
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Multiple is a number that may be divided by another a certain number of times without a remainder. Billy found it easy to divide 9, because 9 was a multiple of 3. Therefore, the final answer is multiple.
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