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.
the river in newtok, alaska is named the ninglick river.
erosion caused by the rising river has made newtok unsafe.

Explanation:

A summary should capture the main idea. The first option is too general. The second is a specific detail. The third explains the reason (erosion from the rising river making Newtok unsafe) which is key to understanding why the village is on the move.

Answer:

Erosion caused by the rising river has made Newtok unsafe.