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Chinedu was given this problem:$\newline$A person stands at a distance of $18$ meters east of an intersection and watches a car driving away from the intersection to the north at $3$ meters per second. The function $y(t)$ gives the car's distance, in meters, north of the intersection at time $t$. At a certain instant $t_{0}$, the angle $\theta\left(t_{0}\right)$ between the line of sight from the person to the car and the line of sight from the person to the intersection is $0$.$7$ radians. What is the rate of change of the angle $\theta(t)$ at that instant?$\newline$Which equation should Chinedu use to solve the problem?$\newline$Choose $1$ answer:$\newline$(A) $\tan [\theta(t)]=\frac{y(t)}{18}$$\newline$(B) $\theta(t)=\frac{18 \cdot y(t)}{2}$$\newline$(C) $\theta(t)+18+y(t)=180$$\newline$(D) $[\theta(t)]^{2}=18^{2}+[y(t)]^{2}$