One group of funds is holding up the stock market. Barclays says oil prices have to fall to drive a year-end rally.

By Nora RedmondStrategists at Barclays said that a rally at the end of the year would likely need oil prices to lower first.Fading investor momentum has left quant funds as the stock market's main support, and that leaves a year-end rally highly dependent on oil prices, according to Barclays.While…