Answer:
B) the APR after the introductory period expires
Step-by-step explanation:
An introductory period is the fixed amount of time — usually six to 18 months — that a credit card issuer doesn't charge interest. ... But once the honeymoon ends, the remaining balance on your card will be hit with the regular annual percentage rate (APR).
An introductory APR is a promotional interest rate that credit card companies often give new customers for a set number of months after they open an account. Some credit cards offer introductory APRs on purchases, balance transfers, or both. The rate is lower than the regular APR, often as low as 0%.