Which of the Following (If True) Would Most Seriously Contradict

Which of the following (if true) would most seriously contradict the assumptions of determinism?

A) Some behaviors are controlled mostly by heredity and others mostly by environment.
B) Two parts of the brain control the same aspects of behavior.
C) Despite being very determined to succeed, people with low levels of intelligence are unable to accomplish as much as people with high intelligence.
D) Certain behaviors are completely unpredictable.