正确答案：CD
解析：
Watch out for the false shift: 'while' is only stating how much foliage the park has. The real clue is after the semi-colon, and thus we are dealing with an elaboration sentence. "...a chance to....have" indicates that the park is untouched ("dense brush" backs this up).

(A) may sound tempting. But it is also absurd. The park, after all, is not empty of trees, or animals (that refers to the "fauna").

There is nothing to suggest that the park is endangered or imperiled.