In Whose Life Have Epigenetic Processes Likely Played the Most

In whose life have epigenetic processes likely played the most dominant role?

A) 5-year-old Blanca, who is a happy girl with many friends.
B) 20-year-old Tristan, who grew up in a neighborhood of poverty and violence and went on to become a successful architect.
C) 30-year-old Naomi, who is from a wealthy family that has experienced a number of tragedies.
D) 65-year-old Oliver, who has worked hard as a truck driver since he was 19.