Sydney Has Been Described as Having an Internal Locus of Control

Sydney has been described as having an internal locus of control and a high degree of self-efficacy. However, she is still having trouble losing the weight that she wants to lose. According to the social cognitive theorists, the MOST likely cause of her failure to lose weight would be:

A) her perception of herself as a victim.
B) her lack of support from her family and friends.
C) her inability to delay the gratification of eating her favorite foods.
D) her genetic make-up and her slower middle-age metabolism.