Which of the following is formed by constructive erosion?

A.) delta

B.) gully

C.) rill

D.) glacier

Constructive erosion is a constructive force and constructive forces are those that build and create land. Constructive natural forces include deposition of sediment, crustal deformation and volcanic activity. Deltas are complex depositional landforms that develop at the mouths of rivers. Erosion takes broken sediment and deposition deposits the sediment in a new place and forms a delta. So, deltas are formed by constructive erosion.