Question

a way to build good credit is
using only secured loans.
taking out many lines of credit.
paying bills when they are due.
using only credit cards.

Explanation:

To build good credit, consistent and timely bill payment is a key factor as it shows responsible credit behavior. Using only secured loans or only credit cards, or taking out many lines of credit are not effective or may be risky ways to build credit.

Answer:

C. paying bills when they are due.