Two different conductors have the same resistance at $0\,^{\circ}C$. The resistance of the first conductor at $t_1\,^{\circ}C$ is equal to the resistance of the second conductor at $t_2\,^{\circ}C$. What is the ratio of their temperature coefficients of resistance $\alpha_1 / \alpha_2$?
- A$t_1 / t_2$
- B$(t_2 - t_1) / t_2$
- C$(t_2 - t_1) / t_1$
- D$t_2 / t_1$
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