BE&H Manufacturing is considering dropping a product line. It currently produces a multi-purpose woodworking clamp in a simple manufacturing process that uses special equipment. Variable costs amount to $6.00 per unit. Fixed overhead costs, exclusive of depreciation, have been allocated to this product at a rate of $3.50 a unit and will continue whether or not production ceases. Depreciation on the special equipment amounts to $20,000 a year. If production of the clamp is stopped, the special equipment can be sold for $18,000; if production continues, however, the equipment will be useless for further production at the end of 1 year and will have no salvage value. The clamp has a selling price of $10 a unit. Ignoring tax effects, the minimum number of units that would have to be sold in the current year to break even on a cash flow basis is   A. 36,000 B. 4,500 C. 20,000 D. 5,000