【单选题】

It may be inferred from the passage that, in contrast to their present view, microbiologists once believed that

A、only a single feature of endospore biology was responsible for their success
B、potentially, a canning process could be developed that was capable of destroying all endospores
C、ultraviolet radiation was a possible means of destroying microorganisms that practice cellular dormancy
D、cellular mitosis was the root cause of the resilience of the microorganisms under discussion
E、only single-celled organisms, like those of fungal spores, could practice cellular dormancy