In CGS system, the Young's modulus of a steel wire is 2 x 10¹² to double the length of a wire of unit cross section area, the force required is
A. 2 x 10¹³ newtons
B. 4 x 10⁶ dynes
C. 2 x 10¹² dynes
D. 2 x 10⁸ dynes