The answer is C because there is only a dependent clause.
A thorned shrub. It could be part of the rose family, or blackberry. Its not limited to these though
I think that it is:
A.
Adults cannot appreciate the beauty of the natural world as children can.
The second choice best applies to the given excerpt. First, it can be noted from this excerpt that the writer wants to convey a pessimistic view of fate. With that, the last choice will not apply to the paragraph anymore. The second and third choices do not apply as well because all words used were neither jargon nor difficult. Rather the words and phrases used like, "interested...but changed their minds", "frustrated", and "revolution in the mountains", were easy to grasp and quickly conveys how a possibly bright future has turned into a sour one.