The correct answer is B. Palwal.
Palwal district has the lowest forest area in Haryana, with only 0.03% of its total area under forest cover. This is significantly lower than the state average of 3.2%. The main reason for this is that Palwal is a relatively dry district, with an average annual rainfall of only 500 mm. This low rainfall makes it difficult for trees to grow, and as a result, the district has very little forest cover.
The other options are incorrect because they all have a higher forest cover than Palwal. Fatehabad has a forest cover of 0.11%, Faridabad has a forest cover of 0.22%, and Bhiwani has a forest cover of 0.33%.
It is important to have a healthy forest cover for a number of reasons. Forests provide us with oxygen, regulate the climate, and help to prevent soil erosion. They are also home to a variety of plants and animals. As a result, it is important to protect our forests and to increase the forest cover in areas where it is low.