"A. Coal was the main source of energy during the Industrial Revolution" is not true of coal production during the Industrial Revolution, since it was in fact the steam engine that superseded coal later in the Revolution.<span />
It is recorded that the Hominids discovered fire and mastered it, so I would say that the answer is true.
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The age of conflict could be the effect of the 9/11 attacks to politics and popular culture. Among its major conflicts are as follows:
1. The war versus terrorism
2. Civil violence
3. Political misunderstandings.
I hope my answer has come to your help. God bless and have a nice day ahead!