JEE Main 2021 Physics question

A bullet of '4g' mass is fired from a gun of mass 4 kg. If the bullet moves with the muzzle speed of 50 , the impulse imparted to the gun and velocity of recoil of gun are :

• (A)0.4 kg ,
• (B)0.2 kg , 0.05 Correct
• (C)0.2 kg ,
• (D)0.4 kg ,