Answer: The best objective summary of the paragraphs is:
b. Captain Charles Young and the buffalo soldiers were responsible for some of the earliest efforts to conserve our nation's national parks. These African Americans greatly enhanced the system of wagon roads in Sequoia National Park and built the first trail to the top of Mount Whitney.
Explanation: The objective summary option (b) accurately captures the main points discussed in the paragraphs. It highlights Captain Charles Young and the buffalo soldiers as key figures responsible for early conservation efforts in national parks. It mentions their contributions to Sequoia National Park, including the construction of more miles of wagon roads and the first trail to the top of Mount Whitney, which was the tallest peak in the United States at the time. This summary acknowledges their significant role in enhancing the park system and their contributions to protecting and preserving natural areas.