The correct answer is: B. Pat area
The Pat area is a semi-arid region in the central part of Chhattisgarh. It receives an average annual rainfall of 600-800 mm, which is much lower than the rest of the state. The Pat area is characterized by its dry climate, sparse vegetation, and rocky terrain.
The Maikal Range is a mountain range in the eastern part of Chhattisgarh. It receives an average annual rainfall of 1,000-1,200 mm. The Maikal Range is home to a variety of forests, including sal, teak, and bamboo.
The Bastar Plateau is a plateau in the southern part of Chhattisgarh. It receives an average annual rainfall of 1,200-1,400 mm. The Bastar Plateau is home to a variety of forests, including sal, teak, and bamboo.
The Raigarh Plateau is a plateau in the northern part of Chhattisgarh. It receives an average annual rainfall of 1,000-1,200 mm. The Raigarh Plateau is home to a variety of forests, including sal, teak, and bamboo.
Therefore, the Pat area is the area that receives lower rainfall in Chhattisgarh.