In the Context of the So-Called Nature Versus Nurture Debate

In the context of the so-called nature versus nurture debate over human behaviour, which of the following is an example of a possible influence that would be considered "nature"?

A) Associating with antisocial peers
B) Carrying the low-activity MAOA allele
C) Maltreatment as a child
D) Living in a high-crime neighbourhood
E) None of the above