In a shooting test, the probabilities of hitting the target are $$\frac{1}{2}$$ for A, $$\frac{2}{3}$$ for B and $$\frac{3}{4}$$ for C. If they fire at the same target, what is the probability that only one of them hits the target?

A

$$\frac{1}{6}$$

B

$$\frac{2}{3}$$

C

$$\frac{3}{8}$$

D

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