Explanation:

We need to identify the number that is different from the other three based on a common property. Let's examine the divisibility of each number by $4$: Option (1) $12$: $12 \div 4 = 3$. So, $12$ is a multiple of $4$. Option (2) $14$: $14 \div 4 = 3.5$. So, $14$ is not a multiple of $4$. Option (3) $56$: $56 \div 4 = 14$. So, $56$ is a multiple of $4$. Option (4) $20$: $20 \div 4 = 5$. So, $20$ is a multiple of $4$. Based on this analysis, numbers $12$, $56$, and $20$ are all multiples of $4$. However, $14$ is not a multiple of $4$. Therefore, $14$ is the odd one out. Options (1) $12$, (3) $56$, and (4) $20$ are similar because they are all divisible by $4$.