D is the correct answer to this question
B they were first or one of the first ancient societies to make and use iron tools and weapons and introduced them to Mesopotamia
That's A, President Franklin D. Roosevelt. The topic you're asking about is extremely important. I would delve into a bit more research. I can't remember why FDR but I did the test a while back and got an A.
Carnegie invested in the Frick Coke Company because the Frick Coke Company is his main supplier of coke coal.