Which of the following, if it had occurred, would have likely meant that myxoma virus in Australia would have remained more virulent than it ultimately became?

Question

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When a pathogen, like the myxoma virus, is introduced into a dense host population, such as rabbits in Australia, it tends to maintain or even increase its virulence. This is because in a dense population, the virus has ample opportunities to spread, and there is less evolutionary pressure for it to become less deadly. If the host dies quickly but has already transmitted the virus to many others, the virus's virulence doesn't hinder its spread. Conversely, in a less dense population, a highly virulent virus might kill its hosts before spreading widely, selecting for less deadly strains over time.

Which of the Following, If It Had Occurred, Would Have