Question

choose the best idea to add to a summary of a village on the move.
the people of newtok were forced to leave their town.
erosion caused by the rising river has made newtok unsafe.
frozen soil under the ground, called permafrost, is melting.
permafrost has made the soil so soft that it cant hold anything.
the community of newtok has village leaders that help the people.

Explanation:

A summary should capture the main idea. The text likely revolves around why the village is moving. "Erosion caused by the rising river has made Newtok unsafe" directly addresses the core reason (unsafe due to erosion) for the village's movement. The other options are either details (like permafrost melting - which may be a cause of erosion but not as direct a summary point as the effect of erosion making the place unsafe), or less central points (village leaders helping is a secondary detail compared to the main issue of the village being unsafe and potentially having to move).

Answer:

Erosion caused by the rising river has made Newtok unsafe.