“compounding frequency” refers to:
ahow often your interest is calculated and added back into your account
bhow easily you can add money into your account
cwhat type of interest your account earns
dwhat interest rate you can expect from your account

The correct option is A.
Compounding frequency refers to the number of compounding period in one year. It is the number of times when one's interest will be calculated based on the original loan amount. The higher the compounding frequency, the more often one's interest is calculated and added back to one's account.