What is H. R. 3999 trying to solve? A This bill has the potential to prohibit the manufacture, transfer, possession, and use of bump stocks. B This bill has the potential to allow for the manufacture, transfer, possession, and use of bump stocks. C This bill has the potential to prohibit the manufacture and sale of all semi-automatic rifles. D This bill has the potential to allow for the sale and manufacture of semi-automatic rifles to anyone with a license.