I really think it’s B ...Help?

Which values of p and q result in an equation with exactly one solution? px-43=-42x+q choose all answers that apply: a) p=-43 and q=-43 b) p=42 and q=43 c) p=43 and q=−42 d) p=42 and q=42

If you could answer these your a life saver

Can you me find the missing length. i attached an image.