I think that the answer is coins.
Answer:
It continued a convention of medieval artworks, which was to communicate religious ideas.
Explanation:
This altarpiece allowed the pilgrims to respect Saint Antun. These opened inner wings represent the Saint Antun, the place of honour at the centre of the corpus and at his side a pig is portrayed.
Answer: D keystone
Explanation:
The Keystone slightly protrudes from the wall at the point where the arch springs from- a pendentive is a curved triangle of vaulting formed by the intersection of a dome with its supporting arches , a Voussoir is a wedge-shaped or tapered stone used to construct an arch, and an impost ( the second closest to the definition ) is that part of an arch from which the arc swings upward.