Which Sultan was responsible for digging a large number of canals for irrigation in India?

Firoz Shah Tuglaq

The correct answer is Option 4- Firoz Shah Tuglaq

The Sultan of Delhi who is reputed to have built the biggest network of canals in India was Firoz Shah Tughlaq. He was known for his extensive public works projects, including the construction of canals and reservoirs for irrigation purposes. Firoz Shah Tughlaq's efforts in irrigation infrastructure contributed to agricultural development and prosperity in various regions of his empire.