A major commercial hub in Arunachal Pradesh is:

Naharlagun
Bomdila
Pasighat
Roing

The correct answer is: c) Pasighat.

Pasighat is the headquarters of East Siang district in Arunachal Pradesh, India. It is located on the banks of the Siang River, about 300 km from Itanagar, the state capital. Pasighat is a major commercial hub in Arunachal Pradesh and is well-connected by road and air to other parts of the state. The town is home to a number of government offices, educational institutions, and hospitals. Pasighat is also a popular tourist destination, with a number of scenic spots in the vicinity.

Naharlagun is a town in Papum Pare district in Arunachal Pradesh, India. It is located about 15 km from Itanagar, the state capital. Naharlagun is a major educational hub in Arunachal Pradesh and is home to a number of colleges and universities. The town is also well-connected by road and air to other parts of the state.

Bomdila is a town in West Kameng district in Arunachal Pradesh, India. It is located about 350 km from Itanagar, the state capital. Bomdila is a popular tourist destination, with a number of scenic spots in the vicinity. The town is also home to a number of government offices, educational institutions, and hospitals.

Roing is a town in Lower Dibang Valley district in Arunachal Pradesh, India. It is located about 500 km from Itanagar, the state capital. Roing is a major commercial hub in Lower Dibang Valley district and is well-connected by road and air to other parts of the state. The town is home to a number of government offices, educational institutions, and hospitals.