The correct option is A Frog
Regeneration is the restoration or renewal of the lost or damaged part/tissue/organ.
Salamander's limb regeneration begins just hours after it is dropped or loses it.
Frog tadpole also possesses the same ability as that of salamander but however, they lose this property once they become adult. Thus, frogs do not regenerate.
The crab's limbs can be manually pulled off or they can shed their limbs and then about a year later after a series of moults, they regenerate.
Hence, the correct answer is option C 'frog'.