Hello, the answer you are looking for is in fact C. Loans. It says in my reading assignment that, "Commercial banks checking accounts are the principal means of payment in the economy and are widely accepted as money. Although commercial banks do purchase investment securities like stocks and bonds, their Principle assets are loans made directly to businesses firms, individuals, and family's, and other borrowers."
If you need more information here is the URL I used to get this information,
https://courses.jmhs.com/content/enforced/7056-CE011_20_1/Personal%20Finance/CE011%20Part%201/Lesson_1/Reading%20Assignment%20Lesson%201.pdf?_&d2lSessionVal=nR0I7FLcrb4A6JQnFpcK5YT8o&ou=7056
Third page, second to last paragraph.
Hope you have a blessed day. If possible i would like brainliest please. Thank you.