Why Do Scientists Believe There Was Once Liquid Water on Mars

Multiple Choice

Why do scientists believe there was once liquid water on Mars?

A) Depositional landforms are seen on Mars, but not erosional landforms.
B) Landforms such as river channels and sandbars are seen on Mars.
C) Large depressions are seen on Mars that were once large lakes.
D) There has been evidence of marine life found in the rocks on Mars.