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An IV administers medication to a patient's bloodstream at a rate of $3$ cubic centimeters per hour.$\newline$At the same time, the patient's organs remove the medication from the patient's bloodstream at a rate proportional to the current volume $V$ of medication in the bloodstream.$\newline$Which equation describes this relationship?$\newline$Choose $1$ answer:$\newline$(A) $\frac{d V}{d t}=3-k V$$\newline$B) $\frac{d V}{d t}=-3 k V$$\newline$(C) $\frac{d V}{d t}=3 k-V$$\newline$(D) $\frac{d V}{d t}=k-3 V$