What is the most likely explanation for the results in the graph?

A. A large growth of algae used up the oxygen in the bay.
B. A toxic chemical killed off all the fish in the area.
C. The fish are harder to catch among the algae.
D. The fish migrated to better feeding grounds.

PLEASE HELPP

What is the most likely explanation for the results in the graph A A large growth of algae used up the oxygen in the bay B A toxic chemical killed off all the f class=