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 and Alf both stay silent,then they:

A) each receive a sentence of one year
B) each receive a sentence of 4 years
C) each receive a sentence of 9 years
D) are both set free
E) each receive a sentence of 13 years