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Urpi was given this problem:$\newline$The side $b(t)$ of the base of a square prism is decreasing at a rate of $7$ kilometers per minute and the height $h(t)$ of the prism is increasing at a rate of $10$ kilometers per minute. At a certain instant $t_{0}$, the base's side is $4$ kilometers and the height is $9$ kilometers. What is the rate of change of the surface area $S(t)$ of the prism at that instant?$\newline$Which equation should Urpi use to solve the problem?$\newline$Choose $1$ answer:$\newline$(A) $S(t)=6[b(t)]^{2}$$\newline$(B) $S(t)=[b(t)]^{3}$$\newline$(C) $S(t)=2[b(t)]^{2}+4 b(t) \cdot h(t)$$\newline$(D) $S(t)=[b(t)]^{2} \cdot h(t)$