Altar is a surface or structure upon which

题目：

Altar is a surface or structure upon which a religious sacrifice is offered. Although the term is sometimes used simply to designate a center for religious ritual or for the worship of deities, and although in many societies sacrifices are offered without an altar, altar and sacrifice are generally connected in the religious history of humanity.
The altar has been ascribed deep religious and symbolic significance. It has been considered a holy and revered object, a place hallowed by the divine presence, where contact and communication with deities and other spirits could be achieved. So sacred was its power, often protected by taboos, that it served, at times, as an asylum for those seeking refuge. At the heart of all altar symbolism lies the idea that it is the center or image of the universe. Particularly in India, the cosmic significance of the altar was fully explored. The ancient sages saw its different parts as representing the various sections of the universe and concluded that its construction was a repetition of creation. The altar, as a heaped-up mound of earth, also symbolized the sacred mother; its very shape could be compared with the body of a woman.
The earliest and most reliable evidence of an altar, dating from about 2000 BC, is a horned limestone structure excavated at the ancient Palestinian city of Megiddo. In the ancient Mediterranean world, altars were not necessarily associated with temples. In some Greek and Roman cults, for example, the altar stood in front of a sacred building, and it was the altar, not the temple, that was the focus of religious ceremony. Very often the form and position of an altar reflected its function: whereas a raised altar was used for sacrifices to the celestial deities of Mount Olympus, for example, pits or trenches served as receptacles for offerings to gods of the earth or the underworld.
In ancient Hebrew religion, altars were used both for animal sacrifice and for offerings of grain, wine, and incense. The function of these altars was the same as in many other religions of the ancient Near East, although there were some important differences. For example, the common pagan belief that sacrifice is a way of feeding the gods acquires a strictly metaphorical meaning in Judaism.
In Christianity the altar held far-reaching religious meaning. Starting from a simple communion table, the altar became a symbol of Christ and was marked with five symbolic wounds at its consecration. Many passages of Scripture lend themselves to symbolic interpretation in connection with the altar. For example, the stone of which the altar is constructed could be viewed as symbolic of Christ, the "cornerstone" of the church (Matthew 21:42). By the Middle Ages (Sth century to 15th century), the Christian altar had become a richly decorated throne on which lay the consecrated host (bread and wine) for the purpose of adoration (see Eucharist). As in many other religions, the altar table in Christianity has been the focal point of unity, reverence, prayer, and worship.

Which of the following dimensions endows an altar with a symbolic meaning

A．Color.

B．Construction.

C．Height.

D．Expans