The correct choice is Amazon CloudFront because it is a global content delivery network that caches static assets at edge locations around the world and brings content physically closer to users to reduce latency without changing the origin application servers.

Amazon CloudFront places copies of images downloads and other static web content at edge locations so requests are served from nearby caches instead of the origin. This reduces round trip time and lowers load on the application servers and it integrates with S3 custom origins and supports HTTPS compression and cache invalidation to manage content delivery efficiently.

Amazon Lightsail is a simplified virtual server and application hosting service and it does not provide worldwide edge caching for static web assets so it will not by itself reduce global delivery latency.

Amazon Route 53 is a DNS and traffic management service and it can route users to low latency endpoints but it does not cache or accelerate content at edge locations so it will not directly speed up static asset delivery.

Amazon ElastiCache provides in-memory caching for databases and application data within a region and it is not designed to distribute static web assets to a global audience so it is not the right choice for reducing worldwide latency for downloads and images.

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