Who acquired the sporting journal Forest and Stream and used it to promote wildlife conservation?

The correct choice is George Bird Grinnell. He was a prominent figure in the conservation movement during the late 19th and early 20th centuries and recognized for his commitment to the preservation of wildlife and natural habitats. Grinnell acquired "Forest and Stream" in 1893 and used the platform to advocate for conservation initiatives and to educate the public about the importance of protecting wildlife and their habitats. He played a significant role in the establishment of national parks and the protection of species, particularly focusing on the American bison and the need for sustainable hunting practices.

The other individuals listed were influential in their own right but did not specifically acquire "Forest and Stream" to promote wildlife conservation. John Muir is known for his work in preserving national parks and his role in the Sierra Club, Rachel Carson is renowned for her environmental activism and her book "Silent Spring," which raised awareness about pesticide use, and Henry David Thoreau is celebrated for his philosophical writings that emphasized a deep connection to nature. While all of them contributed significantly to the environmental movement, it was Grinnell who specifically utilized "Forest and Stream" as a tool for promoting conservation efforts.