The ancient operation in which a stone instrument was used to cut away a circular section of the skull is called trephination. Thus, option (c) is correct.
What is stone?
A piece of rock is referred to as a “stone.” The stones formed as a result of natural rock formation. The stone is the solid mass's compound. This was utilized to construct the structure, walls, and pavement slabs.
Another name for trephination is trepanning. Trephination is one such type of ancient stone tool used in surgical operations. This type of tool is used to remove the circular piece of bone.
As a result, the ancient stone tool for the used the operation is called trephination. Therefore, option (c) is correct.
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