The state bird of Rajasthan is
A. Pavo cristatus
B. Columba livia
C. Choriotis nigriceps
D. Passer domesticus.

Hint: A large with a horizontal body and lengthy bare legs, giving it an ostrich like appearance, this bird is among the heaviest of the flying birds. Depending on availability, this bird will eat worms, small mammals and small reptiles.

Complete answer:
To solve this question, at first, we have to know the name of the state bird of Rajasthan. Ardeotis nigriceps is the large bird of the bustard family (Otididae), one of the heaviest flying birds in the world. The great Indian bustard inhabits dry grasslands and scrublands in some states of India; its highest populations are located in the Indian state of Rajasthan.

Now lets us find the solution from given options –
The peafowl is called Pavo cristatus nativeto the Indian subcontinent. In 1963, the peafowl was declared the National Bird of India due to the fact of its rich religious and legendary involvement in Indian traditions.
Olumba livia is the scientific name of pigeon. Pigeons (Columba livia) stay in close relation with humans. They are a gregarious species that feed in flocks, form big roosts.
Choriotis nigriceps is recognized locally as the godavan is the state bird of Rajasthan. It is a big bird with a horizontal body and long legs giving it an ostrich-like appearance, this bird is among the heaviest of the flying birds.
The house sparrow (Passerdomesticus) is a bird of the sparrow family Passeridae, observed in most regions of the world. House Sparrows like regions which have been changed by humans, including farms, residential, and city areas.

Thus, the right answer is option C. i.e. Choriotis nigriceps.

Note: Desert National Park of Rajasthan along with outside protected areas in Ajmer and Jaisalmer districts are best places to spot Great Indian Bustard in Rajasthan.