Antique Works is owned and operated by a craftsman who makes replicas of historic firearms for museums, sportsmen, and collectors. He is currently producing 40 flintlock muskets per month. Cost data are as follows: Price per unit $720 Variable costs per unit 470 Fixed costs per month 8,000 If Antique expects to sell 40 units per month, how much is his margin of safety expressed in sales revenue? A. $2,760 B. $5,760 C. $3,760 D. $2,000