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What is wrong with E. I have attempted this question twice and have got it wrong both times. Can anyone explain why E is incorrect?
The use of simple past implies that the effect of expansion of China's and Pakistan's nuclear arsenal does not have any effect in the present. This is not the intended meaning because the use of present perfect "has expanded" in the first part of the sentence makes it clear that the author intendes to convey that effect of the expansion for US, as well as for China and Pakistan still has an effect.
Check out this awesome article about Anderson on Poets Quants, http://poetsandquants.com/2015/01/02/uclas-anderson-school-morphs-into-a-friendly-tech-hub/ . Anderson is a great place! Sorry for the lack of updates recently. I...