Many Larger Rivers in the Colorado Plateau Region Meander in Deep

Multiple Choice

Many larger rivers in the Colorado Plateau region meander in deep, narrow canyons and have no floodplains. How could this happen?

A) As sea level rose, the original, old age streams were rejuvenated.
B) Original, old age streams downcut as the land gradually rose.
C) Original, youthful streams continued to downcut as the land rose.
D) As sea level dropped, the original youthful streams matured into old- age streams.