Blossom's Flowers Purchases Roses for Sale for Valentine's Day

Blossom's Flowers purchases roses for sale for Valentine's Day.The roses are purchased for $10 a dozen and are sold for $20 a dozen.Any roses not sold on Valentine's Day can be sold for $5 per dozen.The owner will purchase 1 of 3 amounts of roses for Valentine's Day: 100,200,or 400 dozen roses.The opportunity loss for buying 400 dozen roses and selling 200 dozen roses at the full price is

A) -$2,000.
B) $1,00.
C) $0.
D) $500.