A is 3 years older than B and 3 years younger than C. B and D are twins. How older is C than D?

A 2 years

B 3 years

C 6 years

D 12 years

Correct Answer: Option C

Since B and D are twins, so B = D.

Now, A = B + 3 and A = C - 3.

Thus, B + 3 = C - 3 D + 3 = C-3 C - D = 6.