Which business magnate, often called 'El Ingeniero', transformed a small metal stamping shop into Grupo Carso, a sprawling empire in retail, telecoms, construction and energy?

• A German Larrea
• B Gustavo Cisneros
• C Lorenzo Zambrano
• D Carlos Slim ✓

Carlos Slim Helu, a civil engineer, acquired Telmex in 1990 and built the largest fortune in the region.