A company's dynamic website is hosted on on-premises servers in the United States. The company is launching its product in Europe and wants to improve site loading times for new European users. The site's backend must remain in the United States. The product launches in a few days and an immediate solution is required. What should the solutions architect recommend?

The correct option is to use Amazon CloudFront with a custom origin pointing to the on-premises servers. CloudFront is a Content Delivery Network (CDN) that caches content at edge locations globally. By pointing CloudFront to the on-premises servers as a custom origin, European users will retrieve content from a nearby edge location, significantly reducing latency and improving loading times, while the backend remains in the US. This is a quick and effective solution for immediate improvement. Launching an EC2 instance in us-east-1 (US) would not improve performance for European users. Moving the website to Amazon S3 is for static content and doesn't address the dynamic nature of the website or the need to keep the backend in the US. Route 53 geoproximity routing is for directing traffic to different AWS resources based on user location and resource location, but it doesn't cache content or accelerate delivery from an on-premises origin in the same way CloudFront does.