which of the following expressions evaluates as true?

Consider the following assignments
$x = 9
$y = 7
$z = 5
Given these assignments, which of the following expressions evaluates as true?

A.
($x – $y) != ($y – $z);

B.
($z * 2) <= $x;

C.
($y + $z + $x) == $y*3;

D.
($x – 2) > $y;