Which architect is credited with first using reinforced concrete as the primary material in a major residential project, revolutionizing 20th century architectural possibilities?

Throughout architectural history, groundbreaking materials have transformed what's possible in design and construction. Innovative architects have often been early adopters of new materials, pushing boundaries and creating revolutionary structures. This trivia question explores a significant material innovation that changed the course of modern architecture and the pioneering figure behind its mainstream architectural adoption.

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Auguste Perret (25 Rue Franklin Apartments, Paris, 1903)
Le Corbusier (Villa Savoye, Poissy, 1931)
Frank Lloyd Wright (Fallingwater, Pennsylvania, 1939)
Louis Sullivan (Wainwright Building, St. Louis, 1891)