单项选择题
Communication between villages and the nearest town was poor. Roads were bad; there was some attempt to keep them in order, but as each parish was responsible for its own section of road, the state of repair depends on the zeal of the parish officers. There was, however, little wheeled traffic except for farm coaches used by men of wealth. Most traffic was by means of pack horses. Travelers rode on horseback or walked. Since communication was so difficult, the local markets, held weekly at the nearest town, or the fairs, held annually at the greater cities, became important places for the exchange of goods of all kinds.
Poor roads were probably so because of ()
A. the costliness of reforms
B. politics on a parish level
C. the competition between parishes
D. the indolence of local authorities