找到结论是关键:because it cannot compete with colson's , a new store has opened at the location of every store in the shopping district that closed
去weaken这个conclusion的方法,就是其他原因caused the new store closed 那么b选项就可以选出,b选项是说开的都是discount store,那么导致那些new discount stores closed 的原因不是cannot compete with colson's,而是因为spendless