Physiological Measurement of Sexual Arousal in Women Is Measured Using

Physiological measurement of sexual arousal in women is measured using a vaginal photoplethysmograph which

A) indicates the level of blood congestion using a small, noninvasive biological camera.
B) measures the amount of vaginal fluids secreted at various times of arousal.
C) was used by Masters and Johnson to study changes in women's external sex organs.
D) indicates the level of blood congestion using the amount of light reflected in the vaginal walls.