Considerable research on the unconscious

A) fails to verify its existence.
B) reveals no connection to subliminal perception.
C) supports the idea that much cognitive activity is influenced by the unconscious.
D) It is impossible to conduct research on the unconscious.

Considerable research on the unconscious supports the idea that much cognitive activity is influenced by it. There is evidence of unconscious processes in decision-making, perception, memory, and emotions. While some researchers have challenged the concept of the unconscious, the weight of evidence suggests its existence and impact on cognition. Therefore, option C is the correct answer. The other options are incorrect because they contradict established research findings.