The Table Below Shows the Soft Drinks Preferences of People

Multiple Choice

The table below shows the soft drinks preferences of people in three age groups. $\begin{array}{r|ccc} & \text { cola } & \text { root beer } & \text { lemon-lime } \\\hline \text { under 21 years of age } & 40 & 25 & 20 \\\text { between 21 and 40 } & 35 & 20 & 30 \\\text { over 40 years of age } & 20 & 30 & 35\end{array}$
If one of the 255 subjects is randomly selected, find the probability that the person drinks root beer given that the over 40

A) $\frac { 6 } { 17 }$
B) $\frac { 2 } { 17 }$
C) $\frac { 2 } { 5 }$
D) None of the above is correct.