Canadian now increasingly engage in 'out-going', which is shopping across the national border, where prices are lower, Prices are lower outside of Canada in large part because the goods-and-serivces tax that pays for Canadian social services is not applied.
Which one of the following is best supported on the basis of the in formation above?
(A)If the upward trend in out-shopping continues at a significant level and the amounts paid by the government for Canadian social services are maintained, the Canadian goods-and-services tax will be assessed at a higher rate.
(E)Out-shopping purchases are subject to Canadian taxes when the purchaser crossed the border to bring them into Canadian.
请教各位E为什么不对？ 并且我一开始用无关字排除法把A给排除了，因为if 后面的upward trend 原文没有提及，我这样用无关字排除法是不是不合适呢？ | 
