Question

Which of these sentences uses correct capitalization?

Yellowstone National Park, the West's oldest national park, is the site of old Faithful.
Yellowstone National Park, the West's oldest National park, is the site of Old Faithful.
Yellowstone National Park, the West's oldest national park, is the site of Old faithful.
Yellowstone National Park, the West's oldest national park, is the site of Old Faithful.

Answer 1

D Yellowstone National Park, the West's oldest national park, is the site of Old Faithful.

Step-by-step explanation:

Answer 2

Yellowstone National Park, the West's oldest national park, is the site of Old Faithful.

All proper nouns are capitalized in this sentence correctly.