Final answer:
A nocturnal emission is a normal occurrence during adolescence and should not be a cause for concern. During an orgasm, individuals experience rhythmic pelvic contractions and for males, ejaculation.
Step-by-step explanation:
A nocturnal emission is D. a normal occurrence during adolescence. It is not necessarily associated with erotic dreams, nor is it a sign of maladjustment or specifically associated with the end of male puberty. It is a common experience where an involuntary ejaculation occurs during sleep. Moving on to the phrasing of your question regarding the sexual response cycle, during the orgasm phase, individuals experience rhythmic contractions of the pelvis accompanied by uterine contractions in females and ejaculation in males.