human
Question: Scientists dig in a dry area at the bottom of a mountain range. Fossilized shells of freshwater mussels are found in the area. Which is a likely conclusion that scientists will draw based on this evidence?

Choices:
A) Rivers once flowed through the area.
B) Volcanoes were once active in the area.
C) The ocean shoreline once reached this area.
D) Floods were a common occurrence in this area.
gpt
The correct answer is 0: Rivers once flowed through the area..