In one of the most shameful violations of research ethics to date, nearly 400 African American men from were not informed that they had been diagnosed with syphilis and were not provided with available, effective treatments for this illness.

Tuskegee.

Explanation:

As the exercise describes, one of the most shameful violations of research ethics to date, nearly 400 African American men from Tuskegee (later called the Tuskegee syphilis experiment) were not informed that they had been diagnosed with syphilis and were not provided with available, effective treatments for this illness. The aim of this study was to observe and analyze how syphilis proceded when untreated. So, this men were told they were being treated for free.

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