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The correct option is A.
From the passage given above, it can be seen that, Carnegie had the opportunity to work together with Thomas A Scot during the civil war. During this time, he noticed a boom in the iron industry, this made him to resign after the war and he started his own company which specialized in building iron bridges.
Things to use to stand out from other writers is by using emotion as in how you felt towards that specific situation and detail on where and why it happened and the possibilitys on how it wouldnt happen. many people dont seem to use how one felt towards the problem in a essay/story and its more important than people think.
The correct answer is "He is the most famous poet of the modern era." An era is used when referring to a long period of time. A poet that is well known for an era means that they are known know, and will be known for a while. I hope this helps!
B is correct. It is one sentence that can be made into two.