The correct answer is: a) Hornbill.
The hornbill is a large, colorful bird with a long, curved beak. It is found in tropical forests in Africa, Asia, and Australia. The hornbill is the state bird of Assam, India.
The white-winged wood duck is a small, duck-like bird with a white wing patch. It is found in forests in North America. The white-winged wood duck is not the state bird of any state.
The peacock is a large, colorful bird with a long tail. It is found in forests in India and Sri Lanka. The peacock is not the state bird of Assam.
The kingfisher is a small, brightly colored bird with a long, pointed bill. It is found near water in many parts of the world. The kingfisher is not the state bird of Assam.
The hornbill is a popular choice for the state bird of Assam because it is a beautiful and unique bird that is found in the state. The hornbill is also a symbol of strength and power.