please help me with the right option 8

Moon Karak sells tea. The average selling price of a cup is OMR 0.200 and the average variable expense per cup is OMR 0.150. The average fixed expense per month is OMR 900. An average of 20,000 cups are sold each month. The breakeven sales in units (cups) is: Select one: O a. 18,000 O b. 17,000 O c. 16,000 O d. 19,000 O e. None of the answers given