Ahistorian is examining the concept of monarchy, or government ruled by a king. which question might the historian ask if he were organizing his study by region? a. which king today has ruled for the longest time without interruption? b. how have kings in different eras acquired the wealth necessary to support themselves? c. what is the philosophical relationship between a king and his subjects? d. how did european kings justify their power differently from asian kings?

well if the study was for regions then D would make the most sense

explanation: A would be wrong due to the fact it has nothing to do with the differences between regions

B would be wrong due to the fact its about a method not a ruler

c would be wrong due to the fact that it just doesn't meet your region requirement

d mentions regions & monarchy hence forth being your answer

the answer wold be b) travel among nations should be regulated by an international organization

most people were factory or company owners.