The driest region of Haryana is

Rewari
Mahendragarh
Bhiwani
Rohtak

The correct answer is: C. Bhiwani

Bhiwani is the driest region of Haryana. It is located in the northern part of the state and is surrounded by the states of Rajasthan and Punjab. The climate of Bhiwani is arid, with hot summers and cold winters. The average annual rainfall in Bhiwani is about 300 mm.

The other options are incorrect because they are not as dry as Bhiwani. Rewari, Mahendragarh, and Rohtak are all located in the southern part of Haryana, which is a more humid region. The average annual rainfall in these districts is about 500 mm.

The following are some of the reasons why Bhiwani is the driest region of Haryana:

  • It is located in the northern part of the state, which is a more arid region.
  • It is surrounded by the states of Rajasthan and Punjab, which are also arid regions.
  • The climate of Bhiwani is arid, with hot summers and cold winters.
  • The average annual rainfall in Bhiwani is about 300 mm.