Your answers would be B and C.
The most efficient way to eliminate waste is obviously to reduce. If we reduce the intake there wont be as much outtake.
A nurse performing surgery without a surgeon present. Nurse aren't allowed to do surgery.
All the other things on the list are actually what they're supposed to do.
Hope this helps! ;)
Answer: The answer is Erosion
Explanation: It is probable that the natural process of Erosion caused the exposed layers of rock in The Valley.
