Among the Factors That Made Industrialization in Belgium, Northern France

Among the factors that made industrialization in Belgium, northern France, and the northern German states more suitable in the 1830s than earlier in the century was:

A) The gradual imposition of internal toll restrictions.
B) A substantial depression in workers' wages.
C) An improved network of roads, canals, and now railways in this region.
D) A shrinking population, as the result of continued violence in the wake of the Napoleonic Wars.