At December 31, the following amounts before adjusting entries (Column 1) and after adjusting entries (Column II) were reported: Supplies Rent Expense Wages Payable Unearned Rent Revenue Column Unadjusted $18 $20 $8 $21 Column 11 Adjusted $15 $18 $11 $13 Initial journal entries to record cash paid for rent were on the cash basis. What effect did these adjusting entries have on net income for the year ended December 31? Select one: a. $22 decrease b. $4 decrease c. $4 increase d. $20 decrease e. $22 increase The theory stressing recording revenues and related expenses in the same accounting period is the: Select one: a. Matching Principle b. Going Concern Assumption c. Cost Principle d. Conservatism Principle