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Karen is renting buses for a school field trip. The number of buses needed depends on how many students are going on the trip.$\newline$$b =$ the number of buses needed$\newline$$s =$ the number of students going on the trip$\newline$Which of the variables is independent and which is dependent?$\newline$Choices:$\newline$$(A)$ $b$ is the independent variable and $s$ is the dependent variable$\newline$$(B)$ $s$ is the independent variable and $b$ is the dependent variable