JEE Main Physics question

Two blocks of masses 10 kg and 4 kg are connected by a spring of negligible mass and placed on a frictionless horizontal surface. An impulse gives a velocity of 14 ms⁻¹ to the heavier block in the direction of the lighter block. The velocity of the centre of mass is

• (A)30 ms⁻¹
• (B)20 ms⁻¹
• (C)10 ms⁻¹Correct
• (D)5 ms⁻¹