Phillip Is a Graduate Student Whose Major Area of Interest

Phillip is a graduate student whose major area of interest is physiological psychology.What would Phillip be most interested in

A)  the ways in which genetic factors influence and determine behaviour 
B)  the internal factors that lead people to act consistently across a variety of situations 
C)  how people relate to each other and influence each other 
D)  the ways in which behaviour and mental processes change over a lifetime