Itec question can any one help?

Thanks so much guys for taking the time to respond.Our tutor thinks C but i questioned it so she's asked me to find out as in this years itec book it mentions nerves and spine. I just hope this question won't show up in my exam in May!!!:) So far , i've got 2 c's 1 d and my own answer a. any other takers??:hidesbehindsofa:

Hiya,
I'd defo say A, they only work on the nerves and spinal column!
Dee xxx

Thanks so much for that dee.I really should check with the chiropractor next time i visit! Appreciate you taking the time to answer.
Love and light
M