You Don't Consciously Perceive a Brief Masked Visual Stimulus,but You

You don't consciously perceive a brief masked visual stimulus,but you do perceive a slightly longer one,which seems to have lasted the entire duration.What is the implication of this result?

A) Consciousness depends on connections between the brain and the spinal cord.
B) You sometimes construct a perception after a stimulus, not while it is occurring.
C) Unconscious mental processes can complete complex reasoning.
D) You need to have equal activity in both hemispheres of the brain to be conscious.