The correct answer is A. Khizr Khan.
Khizr Khan was the founder of the Sayyid dynasty of the Delhi Sultanate. He was a descendant of the Abbasid Caliphate and was appointed governor of Multan by the Tughluq dynasty. In 1414, he rebelled against the Tughluq sultan and declared himself sultan. He ruled for six years until his death in 1421.
B. Mubarak Shah was the second ruler of the Sayyid dynasty. He was the son of Khizr Khan and succeeded him to the throne in 1421. He ruled for 17 years until his death in 1438.
C. Alauddin Alam Shah was the third ruler of the Sayyid dynasty. He was the son of Mubarak Shah and succeeded him to the throne in 1438. He ruled for 10 years until his death in 1448.
D. Muhammad Shah was the fourth and last ruler of the Sayyid dynasty. He was the son of Alauddin Alam Shah and succeeded him to the throne in 1448. He ruled for 12 years until his death in 1459.