I believe the answer is: d.combining his companies into one company, and controlling all aspects of steel production
Andrew Carnegie believe controlling all aspects of steel production would help him bring the cost of the production down, which is why he buy out every smaller companies who involved in any form of steel productions.
He later on combine all of these companies and absorb them into the Carnegie steel company and fully controlled all transaction on the steel market at its peak.
Answer:Athens
Explanation: nearly everyone in Ancient Greece agreed that Sparta had by far the best army. Athens by far, had the best Navy of all the Ancient Greek city-states
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