All of the options you listed can be ways in which bank deposits help the nation's economy: Giving banks the money to loan and invest, Giving consumers the ability to save money and Providing protection for consumers from theft
Giving banks the money to loan and invest: This is the most important benefit of bank deposits. Banks use these deposits to provide loans to businesses and individuals, which fuels economic activity, creates jobs, and stimulates growth.
Giving consumers the ability to save money: This is also beneficial, as it allows individuals to build wealth and invest in their future. It also helps to stabilize the economy by providing a buffer against financial shocks.
Providing protection for consumers from theft: While not the main reason for bank deposits, holding funds in a bank account offers some protection against theft compared to keeping cash at home.