Two students designed the experiment shown here to study soil erosion. A steady stream of water flows from the faucet into the tray holding sand and gravel. The water forms a channel by eroding some of the sand and gravel. How can the students increase the amount of sand and gravel being eroded?
ABy increasing the water temperature
BBy adding coarse gravel to the tray
CBy increasing the tilt of the tray
DBy reducing the amount of flowing water