"The large distance to other countries makes importing and exporting difficult" results from the fact that most of the countries in North America are bordered by oceans on both sides.
Option: C
Explanation:
For decades, intermediaries have often been engaged in importing and exporting, owing partly to the great distances covered and various native languages spoken.The three seas bordering North America are the Atlantic, the Pacific and the Arctic Ocean.
Due to the long and hectic distance, earlier it was very difficult to follow sufficient import and export in continent comprised with countries like Canada, United States of America and Mexico. Which resulted many conflicts, transformation like rail road construction, remarkable voyage took place to discover better and short routes for trade.