Epidemiologist: in brazil, schistosomiasis and malaria are the two most common infectious diseases. over the past five years, schistosomiasis has been primarily responsible for the overall increase in infectious disease cases. therefore it is likely that there were more cases of schistosomiasis than malaria five years ago. which of the following most strengthens the argument above? a. over the past five years, the percentage of infectious disease cases caused by schistosomiasis has remained unchanged, but the percentage of cases caused by malaria has increased substantially. b. trends in infectious disease data tend to persist for decades, unless there is a major breakthrough in treatment regimens. c. five years ago, many more people died from schistosomiasis than died from malaria. d. over the past five years, the percentage of infectious disease cases caused by malaria was not significantly greater than the percentage of cases caused by schistosomiasis. e. over the past five years, the percentage of infectious disease cases caused by diseases other than malaria and schistosomiasis did not increase substantially.