A company needs to develop, test, and deploy an application in AWS quickly. Which cloud computing benefit best supports this requirement?

The correct answer is "Increase speed and agility." Cloud computing allows companies to provision resources rapidly, automate development and deployment processes, and iterate quickly on applications. This directly supports the need to develop, test, and deploy an application quickly. "Stop guessing capacity" is a benefit of cloud computing, as it allows for dynamic scaling, but it doesn't directly address the speed of development and deployment. While it contributes to efficiency, it's not the primary benefit for quick development. "Trade fixed expense for variable expense" refers to the financial model of cloud computing (pay-as-you-go), which is a significant advantage but doesn't directly relate to the speed of application delivery. "Achieve economies of scale" is another benefit related to cost savings due to the aggregated demand of many cloud users, but it doesn't explain how an application can be developed and deployed quickly.