C because smollet is the captain and trealawney wants to be part of the crew
The same thing that happened in the 19th century, "The Great Stink". The name is real and it describes an event from the past which would repeat if they started throwing waste again. The river would become so polluted that disease and contagion would begin to spread. In the 19th century, it was cholera. Now, nobody knows.
Scarecrow - Needs a brain
Tin Man - Missing a Heart
Cowardly Lion - Wants Courage
All the answers were within the entire time.