Which of the following defines a secured transaction?

A secured transaction is characterized by a loan arrangement where the lender obtains a security interest in personal property as collateral to secure repayment of the debt. In essence, the borrower gives the lender an interest in specified assets, which can be liquidated if the borrower defaults on the obligation. This arrangement minimizes the lender's risk because it provides a legal claim to the collateral, unlike an unsecured transaction where the lender has no such claim.

The other options do not accurately represent secured transactions. A lease agreement is not classified as a secured transaction because it does not involve a loan. Similarly, a contractual obligation to supply goods or services is a straightforward business transaction and lacks the security interest aspect that defines secured transactions. Lastly, a trade agreement solely focuses on the exchange of products and also does not incorporate any security interest or loan element. Thus, the correct definition of a secured transaction is indeed one that involves a loan of money in exchange for a security interest in personal property.