The correct option is B 12 pairs
Mammals are considered to have twelve pairs of cranial nerves. They are: olfactory nerves (I), optic nerves (II), oculomotor nerves (III), trochlear nerves (IV), trigeminal nerves (V), abducens nerves (VI), facial nerves (VII), vestibulocochlear nerves (VIII), glossopharyngeal nerves (IX), vagus nerves (X), accessory nerves (XI), and hypoglossal nerves (XII).