It is B. structure That ´s correct
The best answer is, D.
Early Christian sarcophagi are known for the ornate, beautiful sculpture that decorates the exterior of the stone. This was done not only for religious purposes, as these sculptures often told biblical stories, but also for cultural ones. Many who lived in Roman territories would display the sarcophagi as symbols of status and recognition of the person's life.
By 1955, carbon dioxide, heat, humidity, and other contaminants produced by 1,200 visitors per day had visibly damaged the paintings. ... Consequently the cave was closed to the public in 1963, the paintings were restored to their original state and a monitoring system on a daily basis was introduced
