well if the study was for regions then <em><u>D</u></em> 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
Answer: increasing population
The arrival of tourists
The space program
Explanation:
Cesare Beccaria was the philosopher who believe all crimes should receive a fair and speedy trial
Answer:
B - The sovereignty of all the states in the union was weakened.