The correct answer is C. Pay-as-you-go pricing. This pricing model is a key benefit of AWS services, allowing companies to pay only for the resources they consume without the need for large upfront investments. This approach contrasts with traditional IT infrastructure, where businesses often have to pay for fixed expenses regardless of actual usage. The pay-as-you-go model provides flexibility and cost savings, as companies can scale their usage up or down based on demand without incurring additional costs for unused resources.