Question 434002
a > b ==> a - b > 0.

Now {{{a - b > a^2 - b^2 = (a-b)(a+b)}}}, or 
{{{a - b > (a - b)(a+b)}}}.  Since a - b is known to be positive we can divide both sides of the last inequality by a - b, without changing the direction of the inequality sign, so that 

1 > a + b.

Hence the answer is letter a.