The correct answer is: A. 300-375 m
The Yamuna-Ghaggar plain is a large alluvial plain in northern India. It is located in the states of Haryana, Rajasthan, and Uttar Pradesh. The plain is formed by the confluence of the Yamuna and Ghaggar rivers. The average elevation of the plain is 300-375 m. The plain is a major agricultural region. It is also home to a number of important cities, including Delhi, Agra, and Jaipur.
Option B is incorrect because the average elevation of the plain is not 500-1000 m.
Option C is incorrect because the average elevation of the plain is not 300-1200 m.
Option D is incorrect because the average elevation of the plain is not 200 m.