The building stone for the Getty Museum is ______.
A. quartz-the same source as the Parthenon, the Piazza Navona, and the Mausoleum of Hadrian
B. iron-the same source as the Farnese Palace, the Arch of Titus, and the Domus Aurea
C. granite-the same source as the Stadium of Domitian, the Piazza of St. Peter's, and teh Santa Costanza
D. travertine-the same source as the Coliseum, Trevi Fountain, and the colonnade of Saint Peter's Basilica