Please explain the question to me.

Question 37 As at 31 December 2011 trade debtors were R1 238 740 and the Allowance for doubtful debts Not yet was R39 420. R29 460 of trade debts have been written off already in the year. The age analysis answered debtors and percentage allowance usually provided are stated on the following table: Marked out of 1.00 Period outstanding Amount Provision Flag question Over 90 days R12 800 100% Over 60 days R84 200 10% Over 30 days R279 400 5% Within credit term R862 340 0% The net effect in the statement of profit or loss and other comprehensive income for the year ended 31 December 2011 would be Select one: O a. a decrease in profit by R35 190 O b. a decrease in profit by R25 230 O c. a decrease in profit by R4 230 O d. a decrease in profit by R33 690