The sudden rise in the credit card bill of Joel would be due to the increase in rates of interest.
Option B is correct.
Interest rate is the percentage being charged on the total amount of borrowed funds being taken by the borrower.
Joel 's credit card bill seemingly risen which he wouldn't noticed in spite of being paid the amounts on time. This happens due to rise in rates of interest being levied on the total amount of credit card.
Therefore, the reason being mentioned in Option B is correct.
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