<em>The Serpent Mound has been attributed to the (A) Adena Indians.</em>
<u>Explanation:</u>
The root of the Serpent Mound, who fabricated it and when, is still generally discussed. During the 1700s a <em>clan of Delaware Indians</em> told a man by the name of <em>John Heckewelder that the Allegheny individuals fabricated the hill. </em>
<em>The Allegheny were a race of individuals who lived preceding the Adena culture, before roughly 1200 BC.</em>