I believe the answer is C due to the fact that delta is built from rocks, mud, soil and moraines is built from rocks, sand, gravel and soil (I tried)
The order that they arrive in is P waves which are also called primary waves and are the fastest then, there are s waves which are known as secondary waves then there are surface waves
The average depth of the Nile is 8-11 meters (±26-36 feet).
That would rule out large ships.
A smaller cruise boat is possible, but there will be other obstacles.
