I think the adjective in the sentence is
Glass
The correct answer is 'Yellowstone National Park, the West's oldest national park, is the site of Old Faithful'. 'Yellowstone National Park', 'West', and 'Old Faithful' are all proper nouns, so they need to be capitalized. 'National park' does not need to be capitalized, because 'park' is a common noun, and 'national' is just an adjective describing it.
Hope this helps!
Answer:
I believe the answer is A. presents all the main points of the subject
I would say that the answer is 2. However