In most of this forest, the expected outbreak of tree-eating tussock moths should not be countered. After all, the moth is beneficial where suppression of forest fires, for example, has left the forest unnaturally crowded with immature trees, and _ _ _

The conclusion of the argument is most strongly supported if which one of the following completes the passage?

(A) more than half of the forest is unnaturally crowded with immature trees ---Correct, this provides an explanation to why outbreak of moth should not be countered.

(B) mature trees are usually the first to be eaten by tussock moths ---Incorrect, its a weakener, if anything this will increase crowding of immature trees.

(C) usually, a higher proportion of mature trees than of immature ones are destroyed in forest fires ---Incorrect, redundant, it has already been mentioned that forest fire increased crowding of immature tress.

(D) the expected outbreak of tussock moths will almost certainly occur if no attempt is made to counter it ---Incorrect, not supported by the passage.

(E) there are no completely effective countermeasures against the moth ---Incorrect, not supported.
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