The correct answer is: B. Ahmed Khan
Ahmed Khan was the commander-in-chief of Alauddin Khalji who invaded Chota Nagpur. He was a successful general who led many campaigns for Alauddin. In 1303, he led an invasion of Chota Nagpur, which was then ruled by the Hindu king Shivkaran Rai. Ahmed Khan’s forces were victorious, and Shivkaran Rai was killed. Ahmed Khan then annexed Chota Nagpur to the Delhi Sultanate.
Shivkaran Rai was the Hindu king of Chota Nagpur who was defeated by Ahmed Khan in 1303. He was a powerful ruler who had extended his kingdom to include much of present-day Jharkhand and Bihar. However, he was no match for Ahmed Khan’s forces, and he was killed in battle.
Chhajju Malik was a general in the army of Alauddin Khalji. He was not the commander-in-chief of the army, and he did not participate in the invasion of Chota Nagpur.
Therefore, the correct answer is: B. Ahmed Khan