Myxoma virus infection is fatal to European rabbits. But why myxoma virus and European rabbits co-exist in Australia? a.

[answerhappygod]

Myxoma virus infection is fatal to European rabbits. But why
myxoma virus and European rabbits co-exist in Australia?
a. The virus evolved and became less virulent to the rabbits
b. European rabbits evolved and became more resistant to
the virus
c. The European rabbits in Australia are different from the
original European rabbits in Europe, and therefore, the virus is
less virulent to them
d. The virus evolved and became less virulent to the rabbits and
the European rabbits in Australia evolved and became more resistant
to the virus, and therefore they co-exist.