Convert each equation to its polar form.

$y-x=6$

• A. $6r=\sin\theta-\cos\theta$
• B. $r=\frac{\sin\theta-\cos\theta}{6}$
• C. $r=6\left(\sin\theta-\cos\theta\right)$
• D. $r=\frac{6}{\sin\theta-\cos\theta}$