Final answer:
The garter snake is the only snake among the options that is not venomous.
Step-by-step explanation:
The snake found in the United States that is not considered to be venomous is the garter snake.
Unlike venomous snakes such as the cottonmouth, copperhead, and rattlesnake, the garter snake does not possess venom glands or fangs to deliver venom. It instead defends itself by releasing a foul-smelling musk and biting if provoked, but its bite is harmless to humans.
Therefore, the correct answer to the question is C) garter snake.
Learn more about Venomous snakes in the United States