The Coca-Cola Company (NYSE:KO)?is close to buying a controlling stake in the sports-drink maker BA Sports Nutrition, LLC?(BodyArmor)?in a deal that values the company at about $8 billion, according to people with knowledge of the matter. A transaction could be finalized in coming weeks, said one of the people, who asked not to be identified discussing private information. A Coca-Cola spokesman declined to comment. A BodyArmor representative didn?t respond to a request for comment.