Lifetron Master | Next Rank: 500 Posts View User Profile Posts: 308 Joined: Thu Mar 29, 2012 12:51 am Thanked: 16 times Followed by:3 members SVA Error by Lifetron » Fri Mar 29, 2013 6:52 pm OA B I chose C. I thought that "single most important factor" can only be singular. Is that right ? Experts pls help ! This question is from an Indian GMAT training institute. I don't know if this a standard GMAT question. But it tests some good grammar concepts. Top Quote