A secured loan is guaranteed by ____________.A.a fixed rateB.interestC.collateralD.an effective rate

The correct answer is C. collateral.

A secured loan is a type of loan that is backed by collateral, which is an asset or property that the borrower provides to the lender to secure the loan. This means that if the borrower fails to repay the loan, the lender has the right to seize the collateral to recover the amount owed. Common forms of collateral include real estate, vehicles, or other valuable assets.

In contrast, options A (a fixed rate) and B (interest) refer to the terms of the loan rather than the security for the loan itself. Option D (an effective rate) is also not related to the security of the loan but rather to the calculation of the cost of borrowing over time, taking into account compounding interest. Therefore, "collateral" is the essential component that makes the loan secured.