Questions Pertain to the Following Table (Table 4) -Refer to Table 4

Questions pertain to the following table (Table 4) :
$\begin{array}{c}\text { Table } 4\\\text { Crosstabulation of Cognitive Impairment Status and Fall Incidence in Hospitalized}\\\text { Elders }\\\begin{array}{r}\\\text { Fall? } \quad\quad\quad\quad\quad\quad\quad\\\begin{array}{|l|l|l|c|c|c|}\hline &&&\text { Yes } & \text { No }&\text { Total }\\\hline \text { Cognitive}&\text { Yes } & \text { Count } & 10 & 30 & 40 \\ \text { Impairment? } &&\% \text { (within falls) } & 25.0 \% & 75.0 \% & 100.0 \% \\&&\% \text { (within impairment) } & 50.0 \% & 25.0 \% & \\\hline &\text { No }&\text { Count } & 10 & 90 & 100 \\&&\% \text { (within falls) } & 10.0 \% & 90.0 \% & 100.0 \% \\&&\% \text { (within impairment) } & 50.0 \% & 75.0 \% & \\\hline &\text { Total }& \text { Count } & 20 & 120 & 140 \\&&\% \text { (within falls) } & 14.3 \% & 85.7 \% & 100.0 \% \\&&\% \text { (within impairment) } & 100.0 \% & 100.0 \% & 100.0 \%\\\hline\end{array}\end{array}\end{array}$
-Refer to Table 4. In this example, what is the value of ARR?

A) .100
B) .150
C) .250
D) .500