How did carnegie’s early job with the railroads greatly contribute to his success in the steel business? a - it taught him how to lay railroad tracks with steel. b - the pennsylvania railroad company was his best customer when he built his business. c - the pennsylvania railroad company paid him well enough so he eventually could invest in his own business. d - it him predict that the demand for steel to build railroad tracks and bridges would grow.

- It helped him predict that the demand for steel to build railroad tracks and bridges would grow.

By working for the railroads, Carnegie gained an insider’s view on how the business would grow and thus helped him forecast that there will be demand  

the answer D is correct

united states reinforcements contributed greatly to three allied victories in france at: cantigny (first major american battle), argonne (the largest in the united states military history, involving 1.2 million american soldiers), and château-thierry (one of the first actions under general pershing).

c. troops marched forward in close formation against newer, more accurate weapons