For all those who have been stuck on this problem despite reading the various explanations given here, search for GMAT + question id. A very good pictorial presentation has been given by "gmat quantum" which I found to be extremely helpful.
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![FLO – Therapy at the Club – Pre-Single [iTunes Plus M4A]](http://is1-ssl.mzstatic.com/image/thumb/Music221/v4/a4/11/88/a41188ed-0f2e-e8d5-1163-d59e373cc58c/26UMGIM30046.rgb.jpg/208x208bb.webp)
