Which reason from among the following is not responsible for the downfall of the Tughlaq Empire?

The downfall of the Tughlaq Empire was caused by multiple factors: the vastness of the empire made administration difficult, autocratic rule created discontent among nobles and subjects, and Feroz Tughlaq's policies (especially the Jagir system) weakened central authority. However, the intervention of Ulemas in politics was NOT a major factor - in fact, Alauddin Khalji had actively tried to reduce their influence, and they did not become a decisive factor in the empire's decline.