Although Most Herbivory Harms the Plant, Some Herbivorous Interactions Do

Although most herbivory harms the plant, some herbivorous interactions do not.Which is not a harmful interaction?

A) Leaf miner insects feed on sugars in leaf cells without killing the leaves.
B) Aphids pierce stems and consume plant sap but do not damage other plant parts.
C) Nematodes feed on the starches in plant roots; the roots live, but their growth is slowed.
D) Gypsy moth caterpillars feed on the leaves of oak and aspen, defoliating and stressing the trees.
E) Bears eat blueberries, then excrete blueberry seeds throughout the forest, and the seeds germinate.