A, electrified wires generate a magnetic field around them, and the electrified wires are subjected to ampere force in the magnetic field. Ampere force on two wires is acting force and reaction force, which are equal in magnitude, so AB is wrong;

C. According to the right-hand screw rule, the magnetic field generated by I 1 at I2 is perpendicular to the paper surface, and according to the left-hand rule, the ampere force on I2 is left; According to the right-hand spiral law, the magnetic field generated by I2 at I 1 is perpendicular to the paper surface, and according to the left-hand law, the ampere force at I 1 is to the right. Then these two wires are far apart; So, C is wrong and D is right;

So choose D.