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The formula gives the temperature change $r$, in degrees Celsius per minute, of tortellini while it is being cooked, given the initial temperatures of the tortellini, $T_{t}$, and the water, $T_{w}$, in degrees Celsius, and a heat conductivity of the tortellini of $k$ joules per square centimeter per second. Which equation correctly gives the heat conductivity of the tortellini in terms of the temperature change per minute and the initial temperatures of the water and tortellini?$\newline$Choose $1$ answer:$\newline$(A) $k=\frac{200(r+T_{w})}{-181T_{t}}$$\newline$(B) $k=\frac{200r}{-181(T_{t}-T_{w})}$$\newline$(C) $k=\frac{200r+T_{W}}{-181T_{t}}$