Assume That Two Marbles Are Drawn Without Replacement from a Box

Multiple Choice

Assume that two marbles are drawn without replacement from a box with 1 blue, 3 white, 2 green, and 2 red marbles. Find the probability of the indicated result.
-The second marble is blue, given that the first marble is red.

A) $\frac{1}{8}$
B) $\frac{1}{7}$
C) $\frac{1}{4}$
D) $\frac{2}{7}$