What Decision Should Be Made by the Optimistic Decision Maker

Short Answer

$$\begin{array} { | l | c | r | r | } \hline & \text { s1 } & \text { s2 } & \text { s3 } \\\hline \mathrm { d } _ { 1 } & 10 & 8 & 6 \\\hline \mathrm { d } _ { 2 } & 14 & 15 & 2 \\\hline \mathrm { d } _ { 3 } & 7 & 8 & 9 \\\hline\end{array}$$
What decision should be made by the optimistic decision maker?