Final answer:
Cavernous bodies and vestibular bulb refer to anatomical terms related to structures involved in sexual arousal in the male and female genitalia, respectively (option a).
Step-by-step explanation:
The correct answer to the question about cavernous bodies and vestibular bulb is a) Terms in anatomy. These terms do not refer to geological formations, literary devices, or political ideologies. Instead, they are associated with the anatomical structures within the human body.
The cavernous bodies, also known as corpora cavernosa, are two columns of erectile tissue found in the phallus that fill with blood during arousal, facilitating erection. The vestibular bulb is part of the female genitalia, consisting of two bulbs of erectile tissue situated on either side of the vaginal opening, also playing a role in sexual arousal by becoming engorged with blood.
Hence, the answer is option a.