Read the text and answer the question. Most snakes are not dangerous, and many are helpful to humans. There are many different types of snakes in the United States, but only four types are poisonous. Snakes help humans by eating other animals that might hurt crops. Snakes can also save human lives. People can make many different kinds of medicine from snake venom.
Which key detail supports the idea that snakes are helpful to humans?
A. "Most snakes are not dangerous, and they are helpful to humans."
B. "Snakes help humans by eating other animals that might hurt crops."
C. "People can make many different kinds of medicine from snake venom."
D. "There are many types of snakes in the United States, but only four types are poisonous."