Muir's writing is on both the beauty and harshness of nature. He talks about the beauty of the flower he discovered, but then talks about having to go without supper or blankets and how storms and the harsh weather conditions became welcomed after probably showing up a lot.
He commands over 27000 crew members
Well, Gettysburg is a city.
Cities' names need to be capitalized.
I say the correct answer is D. - Gettysburg.
If "play" is the name of the person who gave the wonderful speech about honesty, then yes. You would capitalize the P in Play because it is someone's name.