Firuz Shah Tughlaq associated which tax with irrigation?

Correct answer: Haq-i-Sharb

Haq-i-Sharb was a charge connected with the supply or use of irrigation water. The term is associated with the administration of Firuz Shah Tughlaq, who paid attention to canals, wells, and agricultural improvement. Irrigation could help farmers cultivate land and increase production, while the state could collect revenue or a water-related charge from the benefit provided. This makes Haq-i-Sharb different from general land revenue, religious taxes, or compulsory payments imposed on particular communities.

The correct choice is B, Haq-i-Sharb. Kharaj was generally a land-revenue assessment, not the specific irrigation-water charge asked about here. Jizya was a tax imposed on non-Muslim subjects in the relevant medieval administrative context, and zakat was a religious obligation on Muslims. The question links the tax with irrigation, so the water-related term is the logical and historical match. Firuz Shah’s association with canals is a useful memory aid, but the term itself supplies the decisive clue.