请教KAPLAN一道逻辑（对于解释困惑）

When the nineteenth-century German bacteriologist Robert Koch identified a particular bacterium as responsible for cholera, Max von Pettenkoffer, a physician, expressed his skepticism by voluntarily drinking an entire bottle of the allegedly responsible bacteria. Although von Pettenkoffer took his failure to come down with the diease as a refutation of Koch;s hopethesis that cholera was caused by bacteria, Koch argued that von Pettenkoffer had been protected by his own stomach acid. The acid secreted by the stomach Koch explained, kills most ingested bacteria.

Which of the following, if true, provides the most evidence to support Koch’s counterargument?

A  Peptic ulcers, often associated with excessive secretions of stomach acid, are common in certain areas charaterized by low rates of cholera

B  As Pettenkoffer later admiited that he had perviously had cholera

C  Cholera is endemic in areas in which poor sanitation results in high concentrations of cholera bacteria in drinking water

D  Although stomach acid kills most ingested bacteria, large numbers of E.coli bacteria nonetheless manage to make their way to the lower intestine of the digestive tract

E  Cholera bacteria ingested with bicarbonate of soda, a neutralizer of stomach acid, is more likely to result in cholera than if the bacteria is ingested along.

答案是E，我对于答案没有异议，但是对于A选项错误的解释实在是很困惑……

A的错误： According to Koch, the primary way of reansmitting cholera can’t be through ingestion, so extra stomach acid shouldn’t mean less cholera

请指教一二

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