11. The author’s use of the words and phrases “thickets,” “stretching in every direction,” and “extensive forest” (lines 6–7) in Passage A most nearly serves to emphasize which of the following points?
A. The Tian Shan mountains are a challenge to avigate.
B. The apple varieties of Kazakhstan would be difficult for a botanist to catalog.
C. The diversity of plant species in Kazakhstan is crucially important
D. The magnitude of wild apples in Kazakhstan is stunning.