Answer:
b is common sense but I could be wrong
Emperor Diocletian divided the Roman Empire into two sections to make it easier to control.
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The leaders of the Mayan were Itzamn and Kukulcan
The Enlightenment, also known as the Age of Reason, was a philosophical movement that took place primarily in Europe and, later, in North America, during the late 17th and early 18th century. Its participants thought they were illuminating human intellect and culture after the "dark" Middle Ages.
That's what i found on Google when i copied and pasted your statement.
The correct answer is case study.
A case study is a method of psychological research that involves collecting in-depth information and data about an individual person or animal. Information gathered from case studies can be from a combination of questionnaires, interviews, observations etc. Case studies can be conducted when investigating any psychological phenomena, however, they are most useful when investigating psychological or mental disorders.