Sand is supplied to the california coastal region primarily by:
• (a)coastal erosion •
• (b)local biological activity •
• (c)rivers that flow from the sierra-nevada mountains
•(d)ocean floor upwelling

I think the correct answer would be A. Sand is supplied to the California coastal region primarily by coastal erosion. It is a type of erosion that removes sand, sediments through the action of the waves, tidal currents or high winds in a certain beach system. The, the sands that had been eroded are moved to the coastal region of California. 

The answer is c) people evacuated but almost all returned

Answer glacier terminus;