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, wedge - shaped stone at the apex of an arch that locks the other stones in place. In the diagram, part (A) is at the top - most central position of the arch, which is characteristic of a keystone.

Answer:

c. keystone