Welcome to Bytelearn!

Let’s check out your problem:

Zhenghao was given this problem:$\newline$The radius $r(t)$ of a sphere is decreasing at a rate of $1$ meter per hour. At a certain instant $t_{0}$, the radius is $4$ meters. What is the rate of change of the volume $V(t)$ of the sphere at that instant?$\newline$Which equation should Zhenghao use to solve the problem?$\newline$Choose $1$ answer:$\newline$(A) $V(t)=2 \pi \cdot r(t)$$\newline$(B) $V(t)=\pi[r(t)]^{2}$$\newline$(C) $V(t)=4 \pi[r(t)]^{2}$$\newline$(D) $V(t)=\frac{4}{3} \pi[r(t)]^{3}$