The correct answer is A. West to East.
The amount of rainfall decreases in Jharkhand from West to East because the Western Ghats are located in the Western part of the state. The Western Ghats are a mountain range that runs along the Western coast of India. They block the moisture-laden winds from the Arabian Sea, which results in more rainfall on the Western side of the Ghats. As the winds move eastward, they lose moisture and the amount of rainfall decreases.
Option B is incorrect because the South-Eastern part of Jharkhand receives more rainfall than the North-Western part. This is because the South-Eastern part of the state is located in the rain shadow region of the Eastern Ghats. The Eastern Ghats are a mountain range that runs along the Eastern coast of India. They block the moisture-laden winds from the Bay of Bengal, which results in less rainfall on the Eastern side of the Ghats.
Option C is incorrect because the North-West to South-East direction is not a valid direction in Jharkhand. The state is located in the Eastern part of India and the only valid directions are North, South, East, and West.
Option D is incorrect because the North-East to West direction is not a valid direction in Jharkhand. The state is located in the Eastern part of India and the only valid directions are North, South, East, and West.