In Whose Life Have Epigenetic Processes Likely Played the Most

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

A) Five-year-old Blanca, who is a happy girl with many friends
B) Twenty-year-old Tristan, who grew up in a neighborhood of poverty and violence and went on to became a successful architect
C) Thirty-year-old Naomi, who is from a wealthy family that has experienced a number of tragedies
D) Sixty-five old Oliver, who has worked hard as a truck driver since he was 19 years old