Option b is the correct answer. Muhammad Bin Tughluq was the first Sultan of Delhi to participate in the public celebration of Holi. His fascination with the festival led him to adopt it as a court celebration, marking him as possibly the first Muslim ruler to embrace Holi. This gesture of participating in Holi festivities contributed to his goodwill, which even outlasted his reign and extended to his successor, Firoz Shah Tughlaq.