The absence of a uniform tariff rate benefited British exports to America.
Both C and D were both male rulers, so we can rule them out.
Next comes Hatshepsut and Cleopatra.
Cleopatra was a co-regent. Even though she was a very strong person of history, Hatshepsut takes the answer.
Hatshepsut ruled for a whopping 20 years, making her considered one of the most successful female Egyptian rulers.
Hope this helps!
Both Andrew Carnegie Mellon and Henry Clay Frick were industrialists and business partners. Carnegie produced steel and Frick manufactured coke (necessary to produce steel). Frick eventually became chairman of Carnegie's company, but Carnegie made several attempts to force him to renounce to his position and disregarded him, and his opinions, on numerous occasions. This is, therefore, an example of the tensions that the industrialization of the U.S. entailed (there were companies that merged with, or sometimes bought, other companies; companies that used black workers and convicts as labor; companies whose workers went on strike; and hostility towards the wealthy industrialists as well as between them).
The reasons why World War I happened are multiple and complex. One important is the fact that Germany lacked any real colonies prior to World War I, at least compared to the other nations which had massive and important colonies such as Great Britain or France. Another thing was general dissatisfaction and nationalism within the Austro-Hungarian empire.
Because it is the state within the state. Vatican is a state which is governed by the Pope.