The correct answer should be Inexorable because inexorable means unyielding or unrelenting, which would fit the context here.
The answer is "Nature"
The scene described in Walden focuses heavily, if not exclusively, on nature and the effect that the natural wonder of Walden Pond had on Thoreau. This is also the most key element of Transcendentalism: the search for enlightenment not in man-made society but in the natural world.
The three countries that are signers of the North American Free Trade Agreement or NAFTA are Canada, the United States, and Mexico. The answer is option C. The notable persons who signed in the historic NAFTA are Mexican President Carlos Salinas de Gortari, U.S President George H.W Bush, and Canadian Prime Minister Brian Mulroney, last October 1992.