ANSWER
C. For every hour she works, her earnings go up by $12.
Step-by-step explanation
We have the graph that shows the relationship between the amount earned by Lisa and the number of hours she works.
The question we need to solve deals with the slope of the graph, i.e. how the amount earned changes with respect to the number of hours she worked.
If we look at the x and y axes (horizontal and vertical axes respectively) we will see that the amount earned is $12 when time is 1 hour, the amount earned is $24 when time is 2 hours.
If we continue with this pattern, we will see that the amount she earns increases by $12 for every hour that she works.
Therefore, the correct option is C: For every hour she works, her earnings go up by $12.