The correct answer is - B. New Delhi is a coastal city commercial center.
The city of New Delhi is one of the biggest in India, and it is a regional center in whichever way do we look at it, politically, economically, culturally...
New Delhi though, it is not a city that lies on the coastline, but it is actually very fine from the coastline, and it is deep into the mainland. The city is located in the central part of northern India, and its only connection to the sea is through a large river, but it is in way a coastal city commercial center.