Fraser River in the Fraser Plateau Meanders in a Deep

Multiple Choice

Fraser River in the Fraser Plateau meanders in a deep, narrow canyon and has no floodplain.How could this happen?

A) Original, high gradient, youthful stream continued to downcut as the land rose.
B) Original, low gradient, old age stream downcut as the land gradually rose.
C) As sea level dropped, the original youthful stream matured into an old-age stream.
D) As the Fraser Plateau rose, the original, new-age stream became wiser.