1. the pond's (sediment)?

A.evaporation

B.water

C.current

D.residue TRY HARD FOR THE POINTS OR I WILL REPORT YOU IF YOU WILL PLAY AROUND!!!!

Verified Answer :

residue, because when the soil is discharged (or something like that), the pond basin/sediment basin takes it away and some older soil remains.
or it could be water.

D- residue.... water doesn't settle at the bottom and the definition of sediment is matter that settles to the bottom