The correct answer to this question is option 'C', Khizr Khan Sayyid.

Explanation:
During the 14th and 15th centuries, the Delhi Sultanate faced several invasions and conflicts with neighboring kingdoms. One such invasion was led by Timur, the founder of the Timurid Empire. Timur invaded India in 1398, and his forces sacked Delhi and plundered its riches. However, Timur did not establish a permanent rule in India and returned to his empire after a few months.

After Timur's invasion, the Delhi Sultanate was in a state of disarray and multiple claimants to the throne emerged. In 1414, Khizr Khan Sayyid, a prominent noble of the Sayyid dynasty, established himself as the ruler of Delhi. He was the founder of the Sayyid dynasty, which ruled the Delhi Sultanate from 1414 to 1451.

During his reign, Khizr Khan faced numerous challenges, including revolts and conflicts with regional kingdoms. In order to secure his position and seek support against rival claimants, Khizr Khan accepted the suzerainty of Mirza Shah Rukh, the Timurid ruler and the son of Timur. By accepting Mirza Shah Rukh's suzerainty, Khizr Khan acknowledged his authority and established a formal alliance.

This alliance with the Timurids provided Khizr Khan with military and political support, which helped him consolidate his rule in Delhi. It also allowed him to maintain stability and defend against external threats. Khizr Khan's acceptance of Mirza Shah Rukh's suzerainty was a strategic move to secure his position and gain legitimacy as the ruler of Delhi.

In conclusion, Khizr Khan Sayyid, the founder of the Sayyid dynasty, accepted the suzerainty of the Timurid ruler Mirza Shah Rukh to strengthen his rule and seek support against rival claimants to the Delhi Sultanate.