What distinguishes Lynda's credit card use as responsible?

Lynda demonstrates responsible credit card use by making larger purchases and paying her balance in full. This behavior reflects a fundamental principle of credit management: maintaining control over one's spending and ensuring that debts do not accumulate and lead to interest charges.

By paying her balance in full, Lynda avoids accruing interest, which can substantially increase the cost of her purchases over time. Additionally, this practice helps maintain her credit score because credit utilization—how much of the available credit she is using—remains low. A low credit utilization ratio is seen positively by creditors and influences one's ability to obtain favorable terms on future credit.

Other behaviors listed, such as exceeding a credit limit, frequently using a credit card for all purchases without a repayment strategy, or using credit for impulsive buying, would indicate a lack of control and poor management of credit. These practices can lead to financial difficulties, high debt levels, and lower credit scores, showcasing the difference between responsible and irresponsible credit use.