The correct option is A Dirt road
Pre-1700, the British road network hadn’t experienced many major additions since the Romans had built some over millennia and a half earlier. The main roads were largely the decayed remains of the Roman system, known as dirt roads. Despite the appalling conditions of the roads, they were still in use and vital in areas not near a major river or port. Freight went via the packhorse, a slow, cumbersome activity which was expensive and low in capacity. Livestock could be moved by herding them while alive, but this was a tiring process. People used the roads to travel, but the movement was very slow and only the desperate or the rich traveled much. The road system encouraged parochialism in Britain, with few people – and thus few ideas – and few products traveling widely. Hence, Option A is correct. Among the rest, the highway was invented in 1919. Modern aircraft was invented in 1846 by Sir George Cayley and airways started in 1919. Modern Railway began in 1825. Since none of these were available in the eighteenth century, that is the 1700s, hence, the rest of the options are incorrect.