Recall that the slope of a line is given by the formula:
![s=(y_2-y_1)/(x_2-x_1)\text{.}](https://img.qammunity.org/2023/formulas/mathematics/college/bgvzfl7xnjug1q2a39qbpho9edifz4128n.png)
In this case, the y-axis represents the amount of money earned and the x-axis represents the number of hours, therefore the slope represents the amount of money earned per hour.
Answer: Option B.