Please explain the reasoning of the answer

If you were to study twins that were 3 years old and twins that were 50 years old A. Neither the 3-year-old or 50-year-old twins would show a difference in methylation patterns B. The 50-year-old twins would show similar patterns of methylation and the 3-year-old twins would show vastly different patterns of differentiation. C. The 50-year-old twins would show twin to twin differences while the 3-year-old twins would generally be very similar. D. Both sets would show different patterns from their parents. E. Both A and C F. Both B and C G. A, B, and C H. Both C and D