Which Mexican billionaire founded Grupo Carso, a conglomerate spanning retail, infrastructure and mining, and was once the wealthiest person in the world?

• A Carlos Slim ✓
• B German Larrea
• C Ricardo Salinas Pliego
• D Alberto Bailleres

Carlos Slim Helu built his fortune through Grupo Carso and topped the Forbes billionaires list from 2010 to 2013.