"Bracket Creep" happens when

A$)$ tax liabilities are based on real income and there is a negative inflation rate.

B$)$ tax liabilities are based on nominal income and there is a positive inflation rate.

C$)$ too many peculiar people make their way into the highest tax bracket.

D$)$ tax liabilities are based on nominal income and there is a negative inflation rate.

E$)$ tax liabilities are based on real income and there is a positive inflation rate.