When the positive integer $N$ is divided by 6, the remainder is 3.

$N$ can be$: 3, 9, 15, 21, ...$

When the positive integer $M$ is divided by 4, the remainder is 1.

$M$ can be$: 1, 5, 9, 13, ...$

Values for MN can be$: 3, 15, 27, 9, 45, 75, 21, ...$

When they are divided by $12$, the reminders can be $3, 9$

Try all the other values from MN to cross-check. The answer will remain the same.

Answer B E

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