Final answer:
One Hour Loan's key feature is responding to loan requests within an hour.
Step-by-step explanation:
A key feature of One Hour Loan's service is C) Responding to loan requests within an hour after a customer's call to a toll-free number. This means that customers can expect a quick response to their loan requests, providing them with convenience and efficiency. For example, if a customer calls the toll-free number seeking a loan, One Hour Loan aims to process and respond to the request within an hour, allowing the customer to receive the necessary funds promptly.