Answer: C. Behaviorist perspective
The answer is behaviorist perspective because the humanist and behaviorist perspectives are essentially counter-arguments to each other. John B. Watson and B.F. Skinner developed the behaviorist perspective arguing that free will does not exist. They argued this after evaluating the results of an experiment in which the subjects were animals. Carl Rogers and Abraham Maslow, which were humanists, argued that an experiment on animals cannot possibly describe the human psychology, hence the name "humanist".
Explanation: Validity of answer is prooved below.