Why is it important to keep your back and neck straight while performing a hamstring stretch?

Why is it important to keep your back and neck straight while performing a hamstring stretch?
A. You can’t touch your toes with your neck and back bent.
B. Arching the neck and back puts stress on the spine.
C. Bending the back turns this into a spine stretch.
D. The hamstring is only stretched when the back is straight.