Explanation:

Great Indian Bustard(GIB)

• GIB is one of the most critically threatened species in India, with less than 150 birds left in the wild.
• It is a large bird with a horizontal body and long bare legs, giving it an ostrich-like appearance, this bird is among the heaviest of the flying birds.
• Their population is confined mostly to Rajasthan and Gujarat. Small populations occur in Maharashtra, Karnataka and Andhra Pradesh. 
• The bird also happens to be the state bird of Rajasthan.
• Bustards generally favour flat open landscapes with minimal visual obstruction and disturbance, therefore adapt well in grasslands.
• It Listed in Schedule I of the Indian Wildlife (Protection)Act, 1972
• They face threats of hunting, and collision with power-lines during their migration to neighbouring countries, especially Pakistan and Nepal

Hence option 4th is correct.