Marie Is a Graduate Student Whose Major Area of Interest

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

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