A lesson to be learned from the research on flashbulb memories is that

extreme vividness of a memory does not mean it is accurate

Explanation:

In psychology, flashbulb memory is described as an exceptionally vivid and highly detailed "snapshot" of different circumstances and moments in which an individual experiences a piece of news that is considered as consequential and surprising or else "emotionally arousing" was being learned about. Flashbulb memories are being learned by an individual in any specific situation or condition and therefore can be retained for his or her lifetime.

sumerians were polytheistic, meaning they believed in many different gods. so, the best answer is c.