The passage suggests that the lack of an observed decline in the fecundity of the creeping dogwood strengthens the researchers' conclusions regarding pesticide use because the ______.
A.
creeping dogwood is a species that does not resemble other forest plants
B.
creeping dogwood is a species pollinated by a broader range of insect species than are most dogwood species
C.
creeping dogwood grows primarily in regions that were not sprayed with pesticide, and so served as a control for the experiment
D.
creeping dogwood is similar to the red-osier dogwood, but its insect pollinators are known to be insensitive to the pesticide used in the study