Let's Imagine That Solitary Male Lesser Spotted Turkeys Normally Father

Let's imagine that solitary male lesser spotted turkeys normally father two offspring. However, related turkeys may cooperate in attracting females. If one male fathers 10 offspring, but the other fathers none, what is the minimum level of relatedness necessary to offset the subordinates loss of reproductive opportunities?

A) 0.15
B) 0.26
C) 0.50
D) 0.76
E) 2.0