What is the correct order in which you would find stream deposits, starting at the headwaters and going towards the mouth of the river?

From headwaters to mouth a river drops its coarsest load first, so gravel lies upstream, then sand, then fine silt near the mouth.

The reverse order of sand, silt then gravel contradicts how flow energy falls downstream.

An order of silt, sand then gravel would place the finest material upstream, which is wrong.

Because the correct sequence runs coarse to fine, a valid ordering exists and none-of-these does not apply.

Faster upland flow carries only heavy particles, while slow lowland water lets fine silt settle.

This sorting builds gravel beds in the mountains and silty deltas at the sea.