Answer : Option D

Explanation :

If a number is divisible by two co-prime numbers, then the number is divisible by their
product also.
If a number is divisible by more than two pairwise co-prime numbers,
then the number is divisible by their product also.
before proceeding
further.
31214 is not divisible by 3 and 8 => 31214 is not divisible 24
61212 is not divisible by 8 though it is divisible by 3 => 61212 is not divisible 24
512216 is not divisible by 3 though it is divisible by 8 => 512216 is not divisible 24
3125832 is divisible by 3 and 8 => 3125832 is divisible 24