A real estate transaction has a closing date of May 20. The seller, who's responsible for closing costs up to but not including the day of settlement, has already paid annual property taxes of $1,949. Using calendar year proration, the seller will be ______ on the closing statement.

A.Credited $1,207

B.Credited $742

C.Debited $1,207

D. Debited $742

The answer is is A but could you pls explain. I don't understand. Thanks