单选题 Thousands of tired, nerve-shaking, over-civilized people are beginning to find out that going to mountains is going home; that wildness is necessity; and that mountain parks and reservations are useful not only as fountains of timber and irrigating rivers, but as fountains of life. Awakening from the stupefying effects of the vice of over-industry and the deadly apathy of luxury, they are trying as best they can to mix and enrich their own little ongoings with those of Nature.
A. tired, nerve-shaking, over-civilized
B. the deadly apathy
C. as best they can
D. with those of Nature