A problem in statistics is given to three students A,B and C whose chances of solving it independently are $$\frac{1}{2}, \frac{1}{3}$$ and $$\frac{1}{4}$$ respectively. The probability that exactly one of them is able to solve that problem is

A

$$\frac{11}{24}$$

B

$$\frac{9}{24}$$

C

$$\frac{7}{24}$$

D

$$\frac{1}{4}$$