According to the consumption​ function,
what variables determine aggregate spending on consumer goods and​ services?
A. Consumer spending depends on disposable​ income, the real interest​ rate, and other variables such as​ consumers' optimism and wealth.
B. Consumer spending depends on disposable​ income, the real interest​ rate, and the​ export-to-import ratio.
C. Consumer spending depends only on disposable income and the real interest rate.
D. None of the above are correct.