Which Statement About Cell Signaling Is False

Which statement about cell signaling is false?

A) Cells are bombarded with numerous signals, but they do not respond to all of them.
B) A cell must possess the specific receptor to respond to a particular signal.
C) Chemical signaling molecules have specific binding sites.
D) Receptor specificity in cells allows a response to a specific signal.
E) There are only a few kinds of receptor proteins.