Option A is correct because it specifically enables the Compute Engine service and the Cloud Storage APIs, which are necessary for creating instances, setting firewalls, and storing data in Cloud Storage. This approach aligns with Google's recommended practices of only enabling the necessary resources for a specific task, thereby avoiding unnecessary costs. Options B, C, and D are incorrect as they either do not enable the necessary resources or suggest enabling all APIs/resources, which could lead to increased costs and unnecessary resource usage.