Question

look at the diagram above. what is part of the archs anatomy is (a) labeling? a. impost c. keystone b. springing line d. voussoir

Explanation:

The keystone is the central and most important stone in an arch, which holds the other stones in place. In the diagram, part A is at the top - center of the arch, which is the location of the keystone.

Answer:

c. keystone