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 a gold-leaf background, reflecting the emphasis of early Christian art on spirituality