Question 262969
Just pick a random number between 0 and 1 and try it out. Let's pick 1/2. 

{{{x = 1/2}}}
{{{x^2 = (1/2) * (1/2) = 1/4}}}
{{{-x = -1/2}}}
{{{1/x = 1/(1/2) = 2}}}

2 is the biggest number. D must be the answer.