Explanation: Muhammad bin Tughlaq, who ruled the Delhi Sultanate from 1325 to 1351, was known for his ambitious and often controversial economic policies. One of his significant reforms was the taxation of the Doab region, which is the fertile land between the Ganges and Yamuna rivers. The Doab was a crucial agricultural area, and its taxation was aimed at increasing state revenue.
In addition to the Doab taxation, Muhammad bin Tughlaq also levied additional taxes on various goods and services. These measures were part of his broader economic strategy to strengthen the Sultanate's financial position. However, these policies were not without their challenges and controversies. The additional taxes often led to economic hardship for the common people, and the administration of these taxes was not always effective.
It is important to understand the historical context of Muhammad bin Tughlaq's reign. He was a ruler who attempted to modernize and centralize the administration of the Sultanate. His policies were often innovative but also met with resistance and were not always successful. The taxation of the Doab and the imposition of additional taxes were part of his efforts to consolidate power and increase state revenue, but they also contributed to the economic and social unrest that eventually led to the decline of the Tughlaq dynasty.
In contrast, the other options listed do not fit the description provided in the question. Alauddin Khilji, while a significant ruler known for his economic reforms, did not specifically implement the taxation of the Doab or additional taxes as described. Nasiruddin Muhammad Tughlaq, Muhammad bin Tughlaq's son, ruled briefly and did not have the opportunity to implement such policies. Ghiyasuddin Balban, a ruler of the Mamluk dynasty, was known for his military and administrative reforms but not for the specific taxation policies mentioned.
Understanding the economic policies of Muhammad bin Tughlaq is crucial for comprehending the complexities of the Delhi Sultanate period and the challenges faced by rulers in managing a vast and diverse empire. His reign provides a case study in the impact of economic reforms on society and the state's ability to govern effectively.