please solve this question, the answer is (d)

its coming out 12, as m(m+1)(2m+1)/6=4k, k be any constant, so we are required to found numbers when put in place of m gets a numerator that is divisible by 24, numbers- 8,16,24,32,40,48,56,64,72,80,88,96. not getting more 12 to get answer 24.