The correct answer is option 2, Alauddin Khalji. Malik Kafur was the General of Alauddin Khalji. Alauddin Khalji was a powerful ruler of the Khalji dynasty, who reigned from 1296 to 1316. Malik Kafur was a loyal and trusted general who played a crucial role in Alauddin Khalji`s military campaigns and conquests.

Option 1, Balban, is incorrect. Balban was a ruler of the Slave dynasty and reigned before the Khalji dynasty. Malik Kafur did not serve under Balban.

Option 3, Muhammed bin Tughluq, is incorrect. Muhammed bin Tughluq was a ruler of the Tughluq dynasty, which came after the Khalji dynasty. Malik Kafur did not serve under Muhammed bin Tughluq.

Option 4, Firoz Shah Tughluq, is incorrect. Firoz Shah Tughluq was also a ruler of the Tughluq dynasty. Malik Kafur did not serve under Firoz Shah Tughluq.

Overall, it is important to remember that Malik Kafur was the General of