How did the bessemer process contribute to the development of carnegie’s monopoly?
a. it allowed carnegie to produce higher quality steel more quickly, which increased demand.
b. it made transportation of steel faster and more efficient, lowering carnegie’s costs.
c. it allowed carnegie to cut his cost of labor, increasing his profits.
d. it allowed carnegie to replace coal as a fuel supply, cutting his costs.

I believe the answer is:  A. it allowed Carnegie to produce higher quality steel more quickly, which increased demand. 

In bassemer process, they utilize molten pig iron to sustain mast production of steel. This make the overall cost to produce the steel become inexpensive, which eventually attract more customers. This eventually allow Carnegie to monopolize the industry since the competitors started to shut down or taken over.

The way that the Bessemer process contributed to the development of Carnegie's monopoly is that A. it allowed Carnegie to produce higher quality steel more quickly, which increased demand. 

Sorry sir you did not give us the graph i typically but i'm very confused my conclusion is you're missing valuable information in the question