The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
In sharp contrast to Egypt and Mesopotamia, no temples have been found at any Harappan site. We have no religious structures of any kind except the Great Bath, which may have been used for ablutions. Therefore, it would be wrong to think that priests ruled in Harappa, as they did in the cities of lower Mesopotamia. Hence The correct option is A.