Answer:
Condé Nast
Step-by-step explanation:
A conglomerate is a multi-industry company - a company made up of several different, independent businesses. An example of a conglomerate is Condé Nast - a global mass media company that publishes many magazines, including Vogue, The New Yorker, GQ, Glamour, Architectural Digest, etc.
Vogue, Sports Illustrated, and National Geographic are individual magazines (with National Geographic also being a television network. Both the network and magazine are owned by National Geographic Partners).