The Table Below Shows the Number of Years of Jail

The table below shows the number of years of jail time that two burglars, Alf and Doug, will receive, depending on whether each decides to confess and implicate his partner, or to remain silent.

$\begin{array}{}& \text {Doug's Strategies }\\ \text {Alf'sStrategies }&\begin{array} { |l|c|c| } \hline & \text { Confess } & \begin{array}{c}\text { Don't } \\\text { Confess }\end{array} \\\hline \text { Confess } & \begin{array}{c}\text { Doug: 4 } \\\text { A.f: } 4\end{array} & \begin{array}{c}\text { Doug: } 9 \\\text { A.f: 0 }\end{array} \\\hline \text { Don't } & \text { Doug: 0 } & \text { Doug: 1 } \\\text { Confess } & \text { Alf: } 9 & \text { A.f: 1 } \\\hline\end{array}\\\end{array}$
-Based on this table,if Doug confesses and Alf stays silent,then Alf:

A) is set free, and Doug receives a sentence of 9 years
B) receives a sentence of 9 years, and Doug is set free
C) receives a sentence of one year, and Doug is set free
D) is set free, and Doug receives a sentence of one year
E) and Doug both receive sentences of 4 years