What was the most significant cause of the Ilkhanate's collapse?

Question

A. The Ilkhanate collapsed because of the its support of Sufism
B. The Ilkhanate collapsed because it was devastated by the bubonic plague
C. The Ilkhanate collapsed because of internal revolts by the Han Chinese
D. The Ilkhanate collapsed because the ruler did not have a male heir

Answer 1

B. The Ilkhanate collapsed because it was devastated by the bubonic plague

While there were multiple factors contributing to the collapse of the Ilkhanate, the devastation caused by the bubonic plague significantly weakened the economy and population, leading to instability and decline.