Q. A long helical spring having a spring stiffness of 12 kN/m and number of turns 20, breaks into two parts with number of turns 10 each in both the parts. If the two parts are connected in series, then the softness of the resultant spring will be

• (A) 6 kN/m
• (B) 12 kN/m
• (C) 24 kN/m
• (D) 30 kN/m