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Dew point temperature, in degrees Celsius ($^\circ C$), is defined as the temperature to which the air would have to cool in order to reach saturation. For a temperature of $35^\circ C$, an estimate of the dew point can be obtained by first subtracting $20^\circ C$ from the temperature, and then adding $1^\circ$ for every increase of $5$ points in the relative humidity, $R$. If the dew point is $30^\circ C$, which of the following equations best models the situation?$\newline$Choose $1$ answer:$\newline$(A) $30=15-\frac{1}{5}R$$\newline$(B) $30=15+5R$$\newline$(C) $30=15-5R$$\newline$(D) $30=15+\frac{1}{5}R$