S Agrees to Sell B 10,000 Widgets at a Price

S agrees to sell B 10,000 widgets at a price of $1.00 per widget.After B breaches the contract,S resells the widgets for $0.90 per widget.However,this costs S an additional $100 in sales commissions.S saved $200 in shipping costs as the new customer was located closer to its factory.What amount can S recover from B?

A) $900
B) $100
C) $1,100
D) $1,000