A Likely Reason Why a to and Fro Motion, Such

A likely reason why a to and fro motion, such as that encountered during airplane flights or in an automobile ride over a bumpy road, tends to cause nausea and vomiting, is because during such motions:

A) Much air is swallowed and the stomach becomes distended
B) The stomach is more likely to develop reverse peristalsis
C) The cerebral cortex can no longer inhibit an intrinsic tendency of the brainstem to cause vomiting
D) Vestibular reflex eventually excite a chemoreceptor trigger zone in the medulla