Q. Who among the following rulers, ruled for the maximum period?

Correct Answer: a) Bahlol Lodi

Explanation:
Among the given Delhi Sultanate rulers, Bahlol Lodi had the longest reign.
– Bahlol Lodi: 1451–1489 → about 38 years
– Muhammad bin Tughluq: 1325–1351 → about 26 years
– Alauddin Khilji: 1296–1316 → about 20 years
– Balban: 1266–1287 → about 21 years

Thus, Bahlol Lodi ruled for the maximum period among the options.