With Respect to Self-Pleasuring Techniques, Which One Is NOT True

With respect to self-pleasuring techniques, which one is NOT true?

A) Adults who masturbate are, in fact, engaging in self-pleasuring techniques.
B) Adults who do not masturbate are developmentally inhibited.
C) The glans of the clitoris is rarely stimulated directly, although it can be stimulated indirectly when covered by the hood.
D) Dildos and vibrators that have a curve at the end are particularly good for G-spot stimulation.