The argument above depends on which of the following assumptions?

I It is said of parasitic forms of life that, although they burden their hosts, they do not kill them, since a parasite cannot survive unless its host does. Mr. Craig’s prize-winning lilies, however, were invaded by dodder, a parasitic plant, and every one of the lilies died soon after. Plainly, therefore, a parasite can be deadly.

The argument above depends on which of the following assumptions?
A . Mr. Craig did nothing to control the dodder that was invading his lilies.
B . Mr. Craig’s lilies were not infected with a virus deadly to lilies before being invaded by…………….
C . Dodder is not usually a parasite of lilies.
D . Lilies are especially susceptible to being weakened by invading parasites.
E . Mr. Craig’s lilies were invaded by an unusually vigorous strain of dodder.

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Answer: B