Read the passage. Then answer the question. Stingrays have large, flat bodies, with long, wing-like fins. As they swim, they move their entire bodies, waving them in the water. Like sharks, stingrays do not have bones—their bodies are made of cartilage. Cartilage is the bony material that you feel when you touch the end of your nose.

According to the passage, how do stingrays swim?

A. by moving the cartilage in their noses

B. by swimming in the same way that sharks do

C. by waving their whole bodies through the water

D. by flapping wing-like fins on the side of their bodies