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Greenleafable
Assuming this is the image you are referring to, the correct answer would be C. keystone.
Keystone, aka capstone, is the final stone that is added to an arch in order to lock all the stones together, so that nothing will fall apart. An impost is found in the middle of a column, and it is labeled C in this diagram. Springing line is the line where the arch starts "arching." And voussoir is the stone used to make this arch - labelled B in your diagram.
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dubeyshailja64

The part of the arch's anatomy that is labeled as A is the keystone.

What is a keystone?

A keystone (or capstone) refers to a wedge-shaped stone at the center of the arch. It is placed at the end when the arch is constructed.

Keystone is the key support to the arch without which the arch may collapse.

It is at the center and hence the A labeled part is the keystone.

Learn more about keystone here:

https://brainly.com/question/12370116

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