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Jonah is engaging in the activity of budgeting. Budgeting involves calculating one's income, determining expenses, and deciding how much money should be allocated for various purposes like savings, bills, and other expenditures.
In this scenario, Jonah is analyzing his monthly earnings, subtracting his basic living expenses from that amount, and then identifying how much money he can allocate towards savings. This practice helps individuals manage their finances effectively, prioritize their spending, and work towards achieving their financial goals.
So, the correct answer to the question is:
C. Budgeting
I hope this explanation helps you understand why budgeting is the relevant activity in this situation. If you have any more questions or need further clarification, feel free to ask!