Which of the Following Is the "Critical Issue" When It

Which of the following is the "critical issue" when it comes to Sigmund Freud's theory of the unconscious?

A) whether the unconscious is part of one's awareness from the moment of birth or must develop over the first several years of life
B) whether sexual and aggressive urges operate primarily at an unconscious level and in conflict with each other
C) whether the unconscious actually exists and is open to scientific validation using appropriate research methods
D) if people can, with training, become consciously tapped into their unconscious in the same way that biofeedback can help them gain control over involuntarily physical functions
E) whether ego defense mechanisms that keep unconscious conflict hidden from awareness are adaptive or maladaptive