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Ellie is making a scrapbook. The scrapbook grows thicker as she adds more photos.$\newline$$t =$ the thickness of the scrapbook$\newline$$p =$ the number of photos added$\newline$Which of the variables is independent and which is dependent?$\newline$Choices:$\newline$(A) $t$ is the independent variable and $p$ is the dependent variable$\newline$(B) $p$ is the independent variable and $t$ is the dependent variable