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totally agree with the above explanations IMO E Differences is plural hence eliminate C, D for singular noun helps B changes the meaning by comparing the two ears when the comparison is between how the two ears hear between A and E "between" is the better choice moreover A commits a SV error by using determine which is plural for the singular listener
http://blog.ryandumlao.com/wp-content/uploads/2016/05/IMG_20130807_232118.jpg The GMAT is the biggest point of worry for most aspiring applicants, and with good reason. It’s another standardized test when most of us...