As Timothy Examines Markets That Might Match His Company's Investment

As Timothy examines markets that might match his company's investment requirements, he is particularly interested in the fact that the European Community has an extensive transportation network. This network seems to draw all the member nations closer together physically. What critical factor for ensuring an effective economic union is Timothy most likely examining when reviewing transportation networks?

A) cultural factors
B) trade factors
C) political factors
D) geographic proximity
E) economic factors