文:In the fourteenth century, a number of political developments cut Europe's overland trade routes to southern and eastern Asia, with which Europe had had important and highly profitable commercial ties since the twelfth century. This development, coming as it did when the bottom had fallen out of the European economy, provided an impetus to a long-held desire to secure direct relations with the East by establishing a sea trade. Widely reported, if somewhat distrusted, accounts by figures like the famous traveler from Venice, Marco Polo, of the willingness of people in China to trade with Europeans and of the immensity of the wealth to be gained by such contact made the idea irresistible. Possibilities for trade seemed promising, but no hope existed for maintaining the traditional routes over land A new way had to be found.
题:
2. According to paragraph 1 why was it necessary to find a new way for European merchants to reach the East?
○People in China were finally ready to trade with Europeans
○The European economy was failing because there was no trade with the East
○Traditional ways of trading with the East had becomevery costly
○Commercial routes over land had become blocked because of political events
这题为什么不能选B呀?求问!谢谢!!