Neither a rising standard of living nor balanced trade,by itself ,establishes a country's ability to compete in the international marketplace.Both are required simultaneously since standards of living can rise because of growing trade deficits and trade can be balanced by means of a decline in a country's standard of living.

If the facts stated in the passage above are true, a proper test of a country's ability to be competitive is its ability to

A )balance its trade while its standard of living rises

B)balance its trade while its standard of living falls

C)increase trade deficits while its standard of living rises

D)decrease trade deficits while its standard of living falls

E)keep its standard of living constant while trade deficits rise

OG解释...a proper test of a country's ability to compete in the international marketplace will establish that both of these conditions are met simultaneously.照我的理解就是要把trade 和standard of living 平衡起来，答案选A，从那里可以看出呢？B为什么不对呢？谢谢各位！！