Most people use the for intercity travel. A. Train
B. subway system
C. Domestic airports
D. Private bus system

D.Private bus system

Explanation:

private bus

Most people use buses for traveling because these are very cheap. Also, buses are everywhere unless train, subway system, domestic airports. Intercity roads connects principal towns and cities. For instance, in Mexico it is common to travel by executive or first class bus and this is always a first world experience.

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