In a competition,$A, B$,and $C$ are participating. The probability that $A$ wins is twice that of $B$,and the probability that $B$ wins is twice that of $C$. Then,the probability that $A$ loses is:
- A$\frac{1}{7}$
- B$\frac{2}{7}$
- C$\frac{4}{7}$
- D$\frac{3}{7}$
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