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Ling is an avid runner who purchases a new pair of running shoes every $300$ miles. The number of pairs of shoes Ling buys each year depends on how many miles she runs in that year.$\newline$$p =$ the number of pairs of shoes Ling buys in a year$\newline$$m =$ the number of miles Ling runs in a year$\newline$Which of the variables is independent and which is dependent?$\newline$Choices:$\newline$(A) $p$ is the independent variable and $m$ is the dependent variable$\newline$(B) $m$ is the independent variable and $p$ is the dependent variable