Final answer:
Brian Epstein first saw the Beatles at a. The Cavern Club in Liverpool, which led to him becoming their manager and helping them achieve international fame.
Step-by-step explanation:
Brian Epstein first saw the Beatles at a. The Cavern Club. The famous music entrepreneur, who would later become their manager, was running his family’s music store in Liverpool when he first heard of the band. His curiosity piqued, he decided to see them perform live.
On November 9, 1961, Epstein visited The Cavern Club, a venue renowned for its vibrant music scene, and saw the Beatles play. This visit was pivotal as it led to Epstein taking the band under his wing, leading to their eventual international stardom.