In the years since Myxoma was introduced to Australia, the virus and rabbits to the virus.

A. has evolved to become more lethal; have evolved resistance.
B. has evolved to become more lethal; have not changed in their level of resistance
C. has not changed in its lethality; have evolved resistance
D. has evolved to become less lethal; have evolved resistance

The correct answer is option D. "has evolved to become less lethal; have evolved resistance".

Explanation:

The Myxoma virus is a type of poxvirus that originated from South America, it developed on rabbits and it is transmitted by mosquitoes. The virus was purposely introduced to Australia during the 1950s to control the population of rabbits. In the first years the virus was efficient and reduced the population of rabbits from 600 to 100 millions, however, in the following years the virus has evolved to become less lethal and rabbits  have evolved resistance to the virus, allowing a partial rebound of the rabbits' population.

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