Final answer:
Receipts are essential to keep for tax purposes and future preparations of tax returns. Recording all purchases, even small ones, helps track spending habits, including on trendy goods and essential services. Therefore, the correct option is A
Step-by-step explanation:
The documents you should keep until they expire for tax purposes and to help prepare for future tax returns are receipts. Keeping a record of all your financial transactions, such as every item or service you purchase for a certain period, like seven days, can be very insightful. This will help you track how much money you spend on various categories, including goods from 'Merchants of Cool'—those who market trendy items—and essential services like transportation.
It's important to note every transaction, even if it's as small as putting money in a vending machine where you're unlikely to get a receipt. You can jot down these minor expenses on a piece of paper or record them on your smartphone. At the end of the period, you can analyze where your money goes, which can be an eye-opening experience regarding your spending habits and the influence of marketing on your purchasing decisions.