The correct answer is to deploy the application in the EU (Ireland) Region, as it is commonly one of the most cost-effective AWS Regions in Europe. This approach ensures low latency for European users while optimizing costs. Other regions may either have higher costs or result in higher latency, which would not meet the company's primary objectives. It is essential to choose a region close to your user base for low latency, and within the regions available, one must consider cost differences. Deploying in the US East (N. Virginia) Region can be less expensive but would introduce higher latency for European users, countering their requirements, whereas deploying in Asia Pacific (Sydney) Region is geographically distant for European users, introducing unnecessary latency.