The correct answer is B. Sarguja.
Sarguja district has the maximum forest area in Chhattisgarh. It is located in the south-eastern part of the state and has a total forest area of 2,926 square kilometers. The district is home to a variety of forests, including sal, teak, and bamboo forests. The forests in Sarguja are home to a variety of wildlife, including tigers, leopards, elephants, and deer.
The other options are incorrect because they do not have the maximum forest area in Chhattisgarh. Korba district has a total forest area of 2,450 square kilometers, Koriya district has a total forest area of 1,900 square kilometers, Mahasamund district has a total forest area of 1,700 square kilometers, and Rajnandgaon district has a total forest area of 1,500 square kilometers.