Why should we care if some species are extinguished, if even half of all the species on earth disappear?

New sources of scientific information will be lost. Vast potential biological wealth will be destroyed. Still undeveloped medicines, crops, pharmaceuticals, timber, fibers, pulp, soil-restoring vegetation, petroleum substitutes, and other products and amenities will never come to light.

It is fashionable in some quarters to wave aside the small and obscure, forgetting that:

- An obscure moth from Latin America saved Australia's pastureland from overgrowth by cactus.
- The rosy periwinkle provided the cure for Hodgkin's disease and childhood lymphocytic leukemia.
- The bark of the Pacific yew offers hope for victims of ovarian and breast cancer.
- A chemical from the saliva of leeches dissolves blood clots during surgery.

Which techniques does Wilson use in this excerpt to convey important information to his readers?

A. Wilson uses humorous anecdotes that make the information more interesting.
B. Wilson uses metaphors that appeal to a wide range of the reader's senses.
C. Wilson relates the significance of the information directly to the reader's life.
D. Wilson refers to empirical statistics to relate the importance of his message.