The correct answer is 'Economies of scale leading to cost savings' because one of the key benefits of using AWS Cloud is the ability to leverage shared resources and infrastructure, which allows for a reduction in costs due to economies of scale. AWS users are able to avoid upfront expenses for hardware and only pay for the computing resources they use. Global presence through multiple regions is an important feature of AWS; however, it is not a direct benefit of adoption but rather an aspect of AWS's infrastructure that enables benefits such as reduced latency. Increased data storage signifies only a part of AWS's capabilities, and while important, it isn't the principal advantage of cloud migration. Finally, perpetual software licensing can indeed be cheaper in cloud settings like AWS compared to traditional on-premises licenses, but perpetual licensing is not a benefit directly resulting from cloud adoption; instead, it's an approach to software procurement that isn't unique to AWS.