Byzantine art is notable for its:

A. early use of bright colors and illuminated manuscripts

B. invention of Abstract Expressionism.

C. replacement of Christian figures with common people

D. development of mathematical perspective.

I got this from google: Using bright stones, gold mosaics, lively wall paintings, intricately carved ivory, and precious metals in general, Byzantine artists beautified everything from buildings to books, and their greatest and most lasting legacy is undoubtedly the icons which continue to decorate Christian churches around the world.

I tried matching it with ur options and I think it’s A but not really sure.
Hope this helps!

C. gallioli because i remebered it from collage