The founder of the Sayyid Dynasty in the Delhi Sultanate was Khizr Khan. The Sayyid Dynasty ruled over Delhi from 1414 to 1451.

Option 1: Khizr Khan - This is the correct answer. Khizr Khan founded the Sayyid Dynasty and ruled as the first ruler of the dynasty from 1414 to 1421. He was appointed as the governor of Multan by Timur and later declared his independence and established his own dynasty.

Option 2: Mubarak Shah - This is not the correct answer. Mubarak Shah was the fourth ruler of the Sayyid Dynasty and ruled from 1421 to 1434. He was the son of Khizr Khan.

Option 3: Muhammad Shah - This is not the correct answer. Muhammad Shah was the sixth ruler of the Sayyid Dynasty and ruled from 1445 to 1449. He was the grandson of Mubarak Shah.

Option 4: Alauddin Alam Shah - This is not the correct answer. Alauddin Alam Shah was the seventh and the last ruler of the Sayyid Dynasty. He ruled from 1449 to 1451 and was the son of Muhammad Shah.

Therefore, the