Joint involved in movement of head from left to right.
Answer A. Atlanto axialAtlanto-occipital (between skull and C1) joint permit nodding of head ( as when indicating approval or YES) and Atlanto-axial joint permits the head to be turned from side to side (as indicating disapproval or NO).
Atlanto axial
Atlanto occipital
C2- C3 Joint
C3- C4 Joint