Why do you think domes and arches are most prevalent in churches and cathedrals? why do you think they are not used more in residential construction?

An arch or dome bonded into solid form by a strong inner layer of concrete sits as one unit, exerting its weight downwards rather than outwards. This makes possible such miracles as the 1st-century Pont du Gard or the 2nd-century dome of the Pantheon.

so a and d are wrong right off the bat. i'd go for c. hope i !

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