Devices That Measure Sexual Arousal Electronically

Devices that measure sexual arousal electronically:

A) are sold for use recreationally, but are not considered valid scientific tools.
B) provide data that is more likely to be affected by response bias than if research subjects are asked to report their levels of sexual arousal.
C) work primarily by monitoring muscle activity in the pelvic region.
D) provide more accurate data than research participants' subjective responses.