Which loan type isn't secured with collateral?

a. none of the answers are correctb. auto loansc. mortgages (home loans)

d. subsidized student loanse. all of the answers are correctf. small business loans

Normally, for a car and home loan, the vehicle or the house is considered the collateral. If you miss payments, the lender can take back the car or foreclose on the home. Student loans do not require collateral.

You added small business loans at the end of the question - these vary. Some do not require collateral and some do. It depends upon the lender.