Dutch elm disease combat plan chances of success

Dutch elm disease, which is caused by the fungus C. ulmi spread by adult scolytid beetles, has already destroyed 70 percent of the elms in the Greenwood Forest. Another naturally ocurring fungus, P. oblonga, kills larvae of the scolytid beetle. Forest rangers plan to introduce P. oblonga into Greenwood forest in order to save the remaning mature elms.

Which of the following, if true about P. oblonga, provides the strongest evidence that the plan will succeed?

A. It is spread by a variety of birds that nest in trees that are the home of scolytid beetle larvae.
B. It has been known to lie dormant within a tree up to ten years before it begins to reproduce.
C. It spreads more slowly than C. ulmi, under most climatic conditions.
D. It does not destroy some commonly found subspecies of scolytid beetles.
E. It has been known to kill maple trees by destroying their root systems