An Economy Pack of Highlighters Contains 12 Yellow, 6 Blue $\frac { 1 } { 3 }$

An economy pack of highlighters contains 12 yellow, 6 blue, 4 green, and 3 orange highlighters. An experiment consists of randomly selecting one of the highlighters and recording its color. Find
The probability that a blue or yellow highlighter is selected given that a yellow highlighter is
Selected.

A) 1
B) $\frac { 1 } { 3 }$
C) $\frac { 1 } { 2 }$
D) 0