How did the Tang people gain the Mandate of Heaven?

Song rulers grew weak and quarreled among themselves.

Arab traders took over the Silk Road trade, which undermined the Tang economy.

Tang invaders from the far north overthrew the Sui dynasty.

A Sui official led a rebellion that caused the Sui dynasty to collapse.

The answer is letter C, when the Tang invaders invaded the Sui Dynasty. The Sui Dynasty was one of the most ruthless dynasties during the medieval China. They were known for their majestic construction like the Grand Canal which had cause many lives. Because of their cruelty, the Tang Dynasty overthrew them, and thus succeeded in the thrown