Which of the following populations will have the greatest overall increase in fitness in the next time period?
\frac{1}{3} fitness level 4
\frac{1}{3} fitness level 4
\frac{1}{3} fitness level 4
\frac{1}{3} fitness level 1
\frac{1}{3} fitness level 4
\frac{1}{3} fitness level 7
\frac{1}{3} fitness level 3
\frac{1}{3} fitness level 4
\frac{1}{3} fitness level 5
\frac{1}{3} fitness level 2
\frac{1}{3} fitness level 4
\frac{1}{3} fitness level 6