The correct answer is: a) Guwahati.
Guwahati is the largest city in the Indian state of Assam and the seat of the Guwahati district. It is also the most populous city in the North East India. The city is located on the banks of the Brahmaputra River and is a major transportation hub for the region. Guwahati is also home to several important educational institutions, including the Indian Institute of Technology Guwahati and the Assam University.
The Lokpriya Gopinath Bordoloi International Airport is the major airport in Assam. It is located in Borjhar, about 20 kilometers from Guwahati city center. The airport is named after Gopinath Bordoloi, who was the first Chief Minister of Assam. The airport has two terminals, the domestic terminal and the international terminal. The domestic terminal handles flights to and from other Indian cities, while the international terminal handles flights to and from other countries.
The other options are incorrect because they are not major airports in Assam. Dibrugarh Airport is located in Dibrugarh, Assam. It is a domestic airport that handles flights to and from other Indian cities. Silchar Airport is located in Silchar, Assam. It is a domestic airport that handles flights to and from other Indian cities. Jorhat Airport is located in Jorhat, Assam. It is a domestic airport that handles flights to and from other Indian cities.