To my knowledge, the correct answer among all of the given choices is C.) Steam. If I'm not mistaken, this was the time that more trains came into use.
I hope this is the answer you were looking for and that it helps!! :)
The rule of Pericles was simply a period of time after the Persian Wars, where Athens was trying to recoup from the war. Oftentimes, this was used to build up the treasury to ensure that Athens would return back to its originally glorious state.
You have not given us the question
ANSWER:
Crusades, military expeditions, beginning in the late 11th century, that were organized by western European Christians in response to centuries of Muslim wars of expansion. Their objectives were to check the spread of Islam, to retake control of the Holy Land in the eastern Mediterranean, to conquer pagan areas, and to recapture formerly Christian territories;
Leading the struggle against apartheid
