what was the purpose of the byzantine art?

A. to glorify the christian religion and to express it's mystery.

B. to make the deceased person afterlife place pleasant.

C. to place on the wall ofg churches that follow a strict frontal pose.

D. to portray human forms in a realistic and anatomically correct manner.

I searched this in goggle but I didn't see the real answer.
p please sagotan Po ng maayos.(◍•ᴗ•◍)❤(◍•ᴗ•◍)❤(◍•ᴗ•◍)❤(◍•ᴗ•◍)❤(◍•ᴗ•◍)❤​