Final answer:
Amazon CloudFront is the AWS service that will help achieve high transfer speeds for streaming educational video content globally.
Step-by-step explanation:
For a company planning to host an educational website on AWS, particularly for streaming video courses globally, Amazon CloudFront is the service designed to help achieve high transfer speeds. Amazon CloudFront is a content delivery network (CDN) service that securely delivers data, videos, applications, and APIs to customers globally with low latency and high transfer speeds. While Amazon S3 is useful for storage, Amazon EC2 for compute capacity, and Amazon RDS for databases, none of these services specifically accelerate content delivery as Amazon CloudFront does.