The Nineteenth Century Was a Period of Unprecedented Economic Growth

The nineteenth century was a period of unprecedented economic growth.What systematic change did NOT encourage this expansion?

A) Expansion of railroads,making costs of transportation cheaper.
B) Increased use and affordability of steamships.
C) Decreased communication costs via the telegraph.
D) Several countries adopting the gold standard,making trade easier.
E) The creation of regional trade organizations,decreasing transaction costs.