Explanation:

Wreathed hornbill

• It is a species of hornbill found in forests from far north-eastern India and Bhutan, east and south through mainland Southeast Asia and the Greater Sundas in Indonesia, except Sulawesi.
• IUCN – Vulnerable

Oriental pied hornbill

• It is considered to be among the smallest and most common of the Asian hornbills. It has the largest distribution in the genus and is found in the Indian Subcontinent and throughout Southeast Asia.
• Its natural habitat is subtropical or tropical moist lowland forests.
• IUCN – Least Concern

Rufous-necked hornbill

• It is a species of hornbill in northeastern India, especially in Arunachal Pradesh, Indian Subcontinent and Southeast Asia. 
• It is locally extinct in Nepal due to hunting and significant loss of habitat.
• IUCN – Vulnerable

Hence option 2nd is correct.