Answer:
d. Most students are young enough not to have much of a credit score or credit history, so a second party such as a parent or guardian can establish security of payment.
Explanation:
A student loan can be defined as a governmental loan or loan sourced from a private lender in order to help a student pay his or her college or university expenses such as tuitions, books, living costs and supplies.
Also, a co-signer refers to an individual who agrees to apply for a loan with a student and as such is saddled with the responsibility of repaying the loan if the student cannot pay or defaults in the repayment of the loan.
This ultimately implies that, a co-signer is legally liable for the loan applied for by the student (borrower), if he or she cannot pay because the co-signer has been confirmed to have a good credit score and credit history.
Hence, the reason most student loans involve a co-signer is because most students are young enough not to have much of a credit score or credit history, so a second party such as a parent or guardian can establish security of payment.