The Table Below Shows the Soft Drinks Preferences of Pepole

The table below shows the soft drinks preferences of pepole in three age groups.
$\begin{array}{l|ccc} & \text { Cola } & \text { Root Beer } & \text { Lemon-lime } \\\hline \text { Under 21 years of age } & 40 & 25 & 20 \\\text { Between 21 and 40 } & 35 & 20 & 30 \\\text { Over 40 years of age } & 20 & 30 & 35\end{array}$

If one of the 255 subjects is randomly selected, find the probability that the person drinks root beer given that they are over 40 .

A) $\frac { 2 } { 17 }$
B) $\frac { 2 } { 5 }$
C) $\frac { 6 } { 17 }$
D) None are correct