Q.. Vikash is doing his homework which is given by his teacher. Would you help him to choose the incorrect sentences?
(a) When the muscles of vocal cords contract and stretch, the vocal cords become tight and thin and a sound of high frequency is produced.
(b) When the muscles relax, the vocal cords become loose and thick and a sound of low frequency is produced.
(c) Due to the shorter vocal cords, the frequency or pitch of a woman’s voice is higher than that of a man.
(d) None of the above