What Happens When River Slopes Are Uplifted Beyond Their Maximum

What happens when river slopes are uplifted beyond their maximum stable slope?

A) They are usually returned to the maximum stable slope by landslides.
B) They are usually returned to the maximum stable angle by erosion.
C) They usually remain at the uplifted angle but are more unstable when earthquakes occur.
D) The river water fills the deeper crevice and maintains that depth.