The correct answer is: A) Indore
Indore is a major crossroads for national highways in Madhya Pradesh. It is located at the intersection of National Highway 52 (connecting Agra to Kolkata) and National Highway 8 (connecting Mumbai to Chennai). Indore is also well-connected to other major cities in India by air, rail, and road.
Jabalpur is located in the eastern part of Madhya Pradesh and is not a major crossroads for national highways. Bhopal is the capital of Madhya Pradesh and is well-connected to other major cities in India by air, rail, and road. However, it is not located at the intersection of any major national highways. Gwalior is located in the northern part of Madhya Pradesh and is not a major crossroads for national highways.