Answer:
A. the dependent variable
Explanation:
The given equation is
![f = 5280m](https://img.qammunity.org/2021/formulas/mathematics/middle-school/ldlyfj3cy2x7ckzc248t4scpn8d4j8rx55.png)
This equation is used to convert a distance between miles and feet,where f represents the number of feet and m represents the number of miles.
The value of f depends on the value of m.
This means that, to find f, we need to first know m.
Therefore f is called the dependent variable.