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$P$ gives the population of a town $t$ years after it was founded.$\newline$What is the best interpretation for the following statement?$\newline$The slope of the line tangent to the graph of $P$ at $t=2$ is equal to $-10$ .$\newline$Choose $1$ answer:$\newline$(A) After $2$ years, the rate of change of the population decreased at a rate of $10$ people per year per year.$\newline$(B) After $2$ years, the town's population decreased at a rate of $10$ people per year.$\newline$(C) Over the first two years, the town's population decreased by $10$ people per year.$\newline$(D) After $2$ years, the town's population decreased at a rate of $10$ people.