To determine the specific months between which a change of $40 occurred in Clarice's savings account, I'd need to see the graph. However, you can identify the months by looking at the graph for any points where the difference in the vertical value (representing the amount of money) between two points is equal to $40.
For example, if the amount of money was $300 at the end of month 2 and $260 at the end of month 3, you would say: "A change of $40 occurred between month 2 and month 3."
Without the graph, I can't provide the specific months, but that's how you would determine it! If you have any specific data points or a description of the graph, I could help you identify it.