Which group of people would be the most concerned about the ability of a firm to make interest and principal payments?

The correct answer is creditors.

Explanation:

Creditors are the person or institutions that provide credit to the firms or other individuals. They charge interest on that credit. These creditors are concerned about the ability of a firm to make interest and principal payments. They provide funds to the firms on the basis of these abilities.  

The firms that do not possess a strong ability to pay back have difficulty in procuring loans.

answer; /// that is so (false);