The statement that best describes how Muscovy rose to power during Mongol rule is:
Princes from Muscovy allied with Mongol leaders in exchange for land and power.
This reflects the historical reality that Muscovite princes, rather than engaging in a consistent war against the Mongols, often cooperated with them, paying tribute in exchange for autonomy and control over their territories, which eventually helped them gain power and build a foundation for the future Russian state.