Suppose you sold one contract of Corn for $4 per bushel (5,000 bushel per contract) for delivery in three months time. Yesterdays price of corn was $4.50 (note: already marked-to-market). Today the spot price of corn is $4.55. If the futures contract is marked to market on a daily basis as the price changes, what is your cash flow per bushel of corn at the end of the day today? (ignore contract size)

A) $0

B) -$0.05

C) $0.55

D) $0.05