Jane writes the following equation to represent the selling price of a couch minus the cost for the store to purchase the couch. What was the cost, c, of the couch? ($4,000 - c = $350)

IT IS NOT "B)" I ALREADY TRIED!!!

A) c = $3,650
B) c = - $3,650
C) c = $4,350
D) c = $3,750