Your answer would be c. oil and gas industry. Hope I helped!
The historical method includes classifying data, analysis of data and finally reporting on data. The method itself is slightly different to the scientific method but in essence wishes to do the same thing as the scientific method - elucidate the secrets of the world and gain new knowledge.
That depends on which historical empire you are considering when you ask. However in general an emperor serves as a figurehead of a government and absolute ruler of the military.
