A wire of length L and 3 identical cells of negligible internal resistance are connected in series. Due to the current, the temperature of the wire is raised by `/_\T` in time `t`. A number N of similar cells is now connected in series with a wire of the same material and cross-section but of length 4L. The temperature of the wire is raised by same amount `/_\T` in same time `t`. The value of N is

Options

A. 4
B. 6
C. 8
D. 9