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Anjali was given this problem:$\newline$A person stands at a distance of $12$ meters east of an intersection and watches a car driving away from the intersection to the north at $4$ meters per second. At a certain instant $t_{0}$, the car is at distance $n\left(t_{0}\right)$ of $9$ meters from the intersection. What is the rate of change of the distance $d(t)$ between the car and the person at that instant?$\newline$Which equation should Anjali use to solve the problem?$\newline$Choose $1$ answer:$\newline$(A) $\tan [d(t)]=\frac{n(t)}{12}$$\newline$(B) $d(t)=\frac{12 \cdot n(t)}{2}$$\newline$(C) $d(t)+12+n(t)=180$$\newline$(D) $[d(t)]^{2}=12^{2}+[n(t)]^{2}$