What Have Researchers Concluded Regarding the Existence of a G

What have researchers concluded regarding the existence of a G spot?

A) Even during the initial stages of excitement, stimulation of this area of the vagina results in intense orgasm.
B) The pudendal nerves that serve the vagina cannot produce the sensation of orgasm, so no G spot exists.
C) There are nerves that connect the clitoris to the walls of the vagina, so clitoral stimulation creates the illusion of vaginal orgasm.
D) There is clear evidence that many women respond to vaginal stimulation.