Which of these is most likely a pair of independent variables? a person’s income and savings the price of steel and the price of a car the price of vegetables and the price of vegetable soup the price of a cell phone and the price of a penthouse

Independent variables are things that can stand alone. Which set of these variables does not rely on each other?  For example the income and savings. I want 1,000,000 in my savings account, however my income is not nearly that high since I only make 19,000. Look at the other pairs and see if there is a correlation between them.