Naili Area of Sirsa, which is shallow and narrow, is found in which part of Haryana?

The correct answer is: C. Undulating sandy plains.

Naili Area of Sirsa is a shallow and narrow depression in the undulating sandy plains of Haryana. It is located in the northern part of the state, between the Aravali hills and the plains of Punjab. The area is characterized by its sandy soil and its low rainfall. The Naili Area is an important agricultural region, and it is also home to a number of wildlife sanctuaries.

The other options are incorrect because:

• Option A: Plains with sand dunes is not a correct description of the Naili Area. The Naili Area is not a plain, and it does not have sand dunes.
• Option B: Aravali hills is not a correct description of the Naili Area. The Naili Area is not located in the Aravali hills.
• Option D: Marshy Land is not a correct description of the Naili Area. The Naili Area is not marshy.