It may be inferred from the passage that, in contrast to their present view, microbiologis

ts 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