Assume that the statement “If you swear, then you will get your mouth washed out with soap” is true. Which of the following statements must also be true?

A. If you don’t swear, then you won’t get your mouth washed out with soap.
B. If you don’t get your mouth washed out with soap, then you didn’t swear.
C. If you get your mouth washed out with soap, then you swore.