Five numbers $$x_1, x_2, x_3, x_4, x_5$$ are randomly selected from the numbers $$1, 2, 3, \ldots, 18$$ and are arranged in the increasing order $$(x_1 < x_2 < x_1 < x_4 < x_2)$$. The probability that $$x_2 = 7$$ and $$x_4 = 11$$ is

A

$$\frac{1}{136}$$

B

$$\frac{1}{68}$$

C

$$\frac{7}{68}$$

D

$$\frac{5}{68}$$