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Consider the following problem:$\newline$The temperature of a cup of cocoa is decreasing at a rate of $r(t)=-5.5 e^{-0.09 t}$ degrees Celsius per minute (where $t$ is the time in minutes). At time $t=2$, the temperature of the cocoa is $72$ degrees Celsius. What is the temperature of the cocoa at $t=10$ minutes?$\newline$Which expression can we use to solve the problem?$\newline$Choose $1$ answer:$\newline$(A) $\int_{2}^{10} r(t) d t+72$$\newline$(B) $\int r(t) d t+72$$\newline$(C) $\int r(t) d t$$\newline$(D) $\int_{2}^{10} r(t) d t$