Use the Following to Answer Questions: Table: Mary, Silvia Payoff

Use the following to answer questions: Table: Mary, Silvia Payoff Table $$\begin{array} { | l | l | c | c | } \hline & & \text { Silvia } & { } \\\hline & & \text { Cooperate } & \text { Cheat } \\\hline \text { Mary } & \text { Cooperate } & 20,20 & 10,40 \\\hline & \text { Cheat } & 40,10 & 15,15 \\\hline\end{array}$$
-(Table: Mary, Silvia Payoff Table) Refer to the table. Mary and Silvia are producers. If Silvia cooperates, what is Mary's dominant strategy?

A) to cheat and earn 40
B) to cheat and earn 15
C) to cooperate and earn 20
D) to cooperate and earn 40