Eutrophication is a process in which a body of water receives too many nutrients. this, in turn, triggers excessive plant and algae growth. often, when the plants and algae die, oxygen-consuming decomposers begin to flourish in the water. this decreases the amount of oxygen in the water, causing fish and other aquatic animals to suffocate and die. which of the following is a the most likely cause of eutrophication? a. dumping sewage and agricultural wastes into a body of water b. diverting water from a natural body of water to a city's public water supply c. introducing an exotic species into a body of water d. acid rain falling into a body of water