A Gardener Treats His Plants with Pesticides, Killing Any Aphids

A gardener treats his plants with pesticides, killing any aphids. Once the aphids die, what likely happens to the mutualistic bacteria inhabiting their digestive tracts?

A) The bacteria would contribute to the decomposition of dead aphids.
B) The bacteria would migrate outside of the digestive tract, and survive on the leaves of garden plants.
C) The bacteria would likely die without their mutualistic aphids, as this is an example of a facultative relationship.
D) The bacteria would likely die without their mutualistic aphids, as this is an example of an obligate relationship.