Question

Which are thought to have contributed to the decline of the Indus Valley civilization?
Choose all answers that are correct.

A. The soil became too salty for crops to grow.
B. People moved to more fertile regions of the subcontinent.
C. Cities were destroyed by raging fires.
D. Major sandstorms blanketed the cities, forcing people to leave.
E. The Indus River and its tributaries changed course.