Which of the Following Results Suggests That the Brain Plays

Which of the following results suggests that the brain plays a role in regulating postural stability?

A) Responses to stretch of the gastrocnemius muscle depends on the participant's expectations about whether the stretch will have destabilizing influences
B) Responses to stretch of the gastrocnemius muscle depends on the health of the cerebellum
C) Responses to stretch of the gastrocnemius muscle depends on the health of the vestibular system
D) All of the above