The Reverend James Smith, who was an eyewitness to history..
a. discussed how ancient Indian mounds revealed the importance of a priest caste
b. saw the remnants of an ancient city that indicated the area around Cincinnati had once been a major trade center
c. described the ruins of ancient pyramids that suggested an Aztecan influence on the Ohio Valley
d. remarked that ancient Indians had left ruins that were more impressive than some modern structures