In order to have a common multiple, you need to be talking about two or more numbers. The question only asked about one number, 18, so there is no correct answer.
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A common multiple of 16 and 18 is 144.
6 is a factor of 18, so the least common multiple is 18.
126 is the Lowest Common Multiple of 18 and 42
the highest common multiple of 14 and 18 is 2
Least Common Multiple (LCM) for 18 36 is 36.