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While on vacation, Caleb plans to write some postcards to his friends. The number of stamps Caleb has will determine how many postcards Caleb can send.$\newline$$s =$ the number of stamps Caleb has$\newline$$p =$ the number of postcards Caleb can send$\newline$Which of the variables is independent and which is dependent?$\newline$Choices:$\newline$(A) $s$ is the independent variable and $p$ is the dependent variable$\newline$(B) $p$ is the independent variable and $s$ is the dependent variable