How Did the Building of Railroads in Latin America, Asia

How did the building of railroads in Latin America, Asia, and Africa facilitate Western economic interests as opposed to regional economic interests?

A) Railroad lines connected resource-rich inland cities to seaports to facilitate Western trade but did not link inland cities to each other.
B) Local economies had no need for railroads since they already had extensive trade networks.
C) Railroad lines destroyed regional trading patterns by offering more profitable trade with Western markets.
D) Local political leaders accepted huge bribes to permit Western railroads to build across their land regardless of the economic damage caused by the building process.