We are constantly bombarded by a variety of stimuli inside and outside of our bodies. Why are we not overwhelmed by sensory information?

A) We do not have receptors for most stimuli.
B) Stimuli are blocked from the receptors by our immune systems.
C) Most stimuli are external to our bodies and we have very few exteroceptors on the outside of the body.
D) A particular receptor type can have different sensitivities to different stimuli.
E) A very tiny percentage of incoming sensory information is received by the cerebral cortex.