The correct option is
C Parotid glands, warty skin and semicircular canals
Toad contains
(i) Parotid glands- There are two parotid glands behind the tympana.
(ii) Skin- It is dry, rough, warty, and non- respiratory. It contains numerous poison glands and fewer mucous glands.
(iii) Head is semicircular.
So, the correct answer is 'Parotid glands, warty skin and semicircular canals'.