All of the following are ways that you as a teen or young adult can improve your credit score EXCEPT...

Apply for multiple credit cards in a short amount of time so that you can show you’re good at managing multiple lines of credit quickly

If you have student loans, begin making small payments to show you’re managing the loan responsibly

Become an authorized user on your parent’s credit card

Apply for a secure credit card and be up to date on payments

The correct answer is letter "A": Apply for multiple credit cards in a short amount of time so that you can show you’re good at managing multiple lines of credit quickly .

Explanation:

Applying for several credit cards at the same time decreases individuals' credit scores. This means for financial institutions that you might need money or simply like making payments on credit, thus, you are prone to fall into debt easily. Just even by applying -before even being approved- your score rating could be affected.