The correct answer is: A. Zafar Khan
Zafar Khan, also known as Muzaffar Shah I, was the founder of the Gujarat Sultanate. He was a Turk who came to India in the service of Alauddin Khalji. He rose to prominence under the reign of Muhammad bin Tughluq, and was appointed governor of Gujarat in 1391. In 1396, he declared himself independent and founded the Gujarat Sultanate. He ruled until his death in 1411.
Option B, Ahmad Shah I, was the second sultan of the Gujarat Sultanate. He ruled from 1411 to 1442.
Option C, Daud Shah, was the third sultan of the Gujarat Sultanate. He ruled from 1442 to 1451.
Option D, Muzaffar Shah II, was the sixth sultan of the Gujarat Sultanate. He ruled from 1511 to 1526.