The correct answer is A. 159 sq km.
According to the India State of Forest Report, 2019, the area of Haryana that comes under the reserved forests is 159 sq km. This is about 1.2% of the total area of the state. The reserved forests are the most protected type of forest in India. They are managed by the government and are not open to the public. The main purpose of reserved forests is to protect the environment and to provide a habitat for wildlife.
The other options are incorrect because they are not the area of Haryana that comes under the reserved forests. Option B is the area of Haryana that comes under the protected forests. Option C is the area of Haryana that comes under the unclassed forests. Option D is the total area of Haryana.