周谢慧老师：E选项属于“偏”，根据文中第二段，四种情况中，有两种情况都属于采购商更换供应商能力有限的时候，但是如果供应商很丰富，supplier partnerships仍然是可以避免的。看这句原文：Alternatives provide a credible threat to suppliers, even if the ability to switch is constrained
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