Answer:
D) The author gives examples of wild horses being trained and then adopted by the U.S. Marine Corps.
Explanation:
In "New Nevada Palominos Enlisting in the U.S. Marines," the author mentions how a wild horse named Okinawa became an essential part of the Mounted Color Guard. In that matter, due to Okinawa's gentle character, Marines adopted seven other wild horses.
Pocahontas was his daughter
The answer could be, Secrets.