Which of the following statements about the body movements of snails is correct?

Options

A. They move with the help of a thick foot that has strong muscles.
B. They move with the help of muscles that extend and shorten their bodies.
C. They move by folding their bodies into several loops, which gives them a push to move forward.
D. They move by moving their bodies to one side, while swinging their tails to the other side.