Millions of years ago, the area pictured was the site of a mountain range. today, a few plateaus are all that remain. what can be said about the remaining rock forms?

a. only the weakest portions of the rock remain.

b. due to a lack of rainfall in the area, rain is not a factor in the erosion process.

c. the rock has been worn down due to continental drift.

d. the remaining forms consist of the hardest rock.