Which of these statements most accurately describes the costs and benefits of using a credit card?
a. credit cards are conveniant but can result in debt.
b. credit cards charge low interest on high cost items.
c. credit cards cost money to use but result in lower prices.
d. credit cards expand purchasing power but produce waste.
d.

I would say actually that the best answer is this one:

A. Credit cards are convenient(typo!)  but can result in debt.

They are convenient, as they allow you to buy goods that maybe you can't afford today, but will tomorrow, as your payment comes.

but if you're not careful, you can abuse them and forget that you will have to give the money back! this might result in you spending more than you can have and debt!