What is the meaning of ‗I promise to pay‘ clause written on notes?

• A. The bank’s obligation to pay the value of banknote does not arise out of a contract but out of statutory provisions.
• B. The bank’s obligation to pay the value of banknote does arise out of a contract but not out of statutory provisions.
• C. This obligation is neither due to a contract nor a statutory provision.
• D. It means that to pay you the value, there is sovereign guaranty.
• E. None of these.