The Ahaia Winter Festival is primarily organised by the North-Eastern state of ______ to promote tourism.​

Correct option is A

• The Ahaia Winter Festival is a multi-cultural festival held in the West Garo Hills of Meghalaya, India.
•  The festival aims to promote the revival of ethnic food culture. 

Here's some more information about the Ahaia Winter Festival:

• In 2013, the sixth version of the Ahaia Winter Festival was held in Chandmary Field, Tura, with the theme "Give Peace a Chance!". 
• In 2010, the Ahaia-Garo Hills Beckons festival was led by children.