The Byzantine mosaics of Emperor Justinian and Empress Theodora from the Church of San Vitale in Ravenna differ from classical Roman mosaics in that they A focus on realism, illustrating the concern of Byzantine art for making religious subject matter more relatable B employ diagonal lines and stacked bodies, showing the focus of early Christian art on drama and emotional impact C portray secular leaders demonstrating the preference of Byzantine art for historic over religious subject matter D favor stylized figures against gold-leâf background, reflecting the emphasis of early Christian art on spirituality