How did Andrew Carnegie gain control of the steel industry?

a. by giving away his money
b. by becoming a partner of Edwin Drake
c. by buying all the other steel mills
D. by practicing vertical consolidation

D

6 answers

http://www.google.com/search?q=andrew+carnegie+gain+control+steel+industry&rls=com.microsoft:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7GGIE_en
so my answer is correct?
that post was from Bella not Anonymous
As I see it, both C and D are correct.

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first i thought it was C. but then my book said that it was illegal to buy all the other productions...and i found D in my book i just wanted to double check
He bought other steel mills -- but not "all" of them. That makes D correct.
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