Final answer:
The correct phase of the Mightiest Governor event in Rise of Kingdoms is the Battle Phase, which involves combat-related activities to earn points.
Step-by-step explanation:
The Mightiest Governor is an event featured in the mobile strategy game Rise of Kingdoms, where players compete for various rewards based on their performance across different phases of the event. Among the options provided, the correct phase of the Mightiest Governor event is B) Battle Phase. This phase typically involves participating in PvP battles, defeating barbarians, and accumulating points through combat-related activities. The other options listed, such as Preparation Phase, Reward Phase, and Healing Phase, are not officially titled phases within the Mightiest Governor event.