The Difference Between an Incised Delta and a Fill Terrace

The difference between an incised delta and a fill terrace is:

A) In a fill terrace, incision into the floodplain occurs first, followed by aggrading and filling of the valley
B) Incised terraces form when a stream cuts through and leaves parts of its former floodplain as benches above the modern floodplain
C) Incised terraces aggrade and fills its valleys with alluvium and then incises into the valley
D) Fill terraces form when a stream cuts through and leaves parts of its former floodplain as benches above the modern floodplain