ProfBob DeSlob Writes a Check on His Big Bank Checking

Prof.Bob DeSlob writes a check on his Big Bank checking account for $1 payable to "Department of Business Law Coffee Club" to pay for his weekly membership and gives it to his colleague Carol.Bob does not place a decimal point after the "1" nor does he complete the line ending in "dollars." Carol,knowing that Bob can well afford it,prints in block letters the words "One Hundred" on the line ending in "dollars." Carol then gives the check to Dot,the department secretary,who is in charge of the Coffee Club.Dot presents the check to Big Bank for payment,and Big Bank charges $100 from Bob's account.Which of the following statements is most accurate?

A) Bob's account must be recredited $99.
B) Bob's account must be recredited $100.
C) Bob contributed to the alteration and may be barred from claiming forgery.
D) Bob had a duty to place a stop-payment order on the check.