Complete the following statement. In the circular flow of income and spending in South Africa, ________ firms in the factor mdrket becomes ________ households, while ________ households in the goods market becomes ________ firms. Expenditure by foreigners on South African products constitutes ________ the circular flow. Select one: 0. income to; spending by; income to; spending by; d leakage from b. income to; income to; spending by; spending by; an injection into c. spending by; income to; spending by; income to; on injection into d. spending by; spending by; income to; income to; a leakage from e. production of; spending by; production of; income to; o leakage from