Edgar: Some of the pumps supplying water to our region have been ordered shut down in order to protect a species of small fish. But it is absurd to inconvenience thousands of people for the sake of something so inconsequential. Rafaela: You' re missing the point. The threat to that fish species is a sign of a very serious threat to our water supply. The dialogue provides the most support for the claim that Edgar and Rafaela disagree over whether ['the order to shut down the pumps was legal', 'shutting down the pumps will actually inconvenience a large number of people', 'shutting down the pumps will be sufficient to protect the fish species', 'the survival of the fish species is the only reason for shutting down the pumps']