The sooner we solve the problem with controlling weapons, the better it will be for all.

A. If we could solve the problem with controlling weapons, the better it will be for all.

B. If would be better for all if we can solve the problem with controlling weapons soon.

C. If all are better, we can solve the problem with controlling weapons.

D. If we can solve the problem with controlling weapons soon, it will be better for all.

D. If we can solve the problem with controlling weapons soon, it will be better for all.