Final answer:
Your grandmother's transactions of buying groceries and paying rent with her Social Security check would be counted in the consumption component of GDP.
Step-by-step explanation:
The transactions of your grandmother who receives a Social Security check from the U.S. government and uses the funds to purchase groceries and to pay her rent will be reflected in the consumption component of GDP. This is because these purchases are personal expenses for living costs and are considered part of consumer spending in the economy.
Other components of GDP include investment, government purchases, and spending on net exports, but these components do not include personal consumption expenditures like those of your grandmother.