Wall Street lower as oil pulls back

U.S. stocks were slightly lower in choppy trading on Thursday morning as oil prices pulled back and investors assessed a set of economic data and comments from Federal Reserve officials. Oil prices rallied nearly 6 percent on Wednesday following an agreement among major oil producing countries to curb output, but were down a day later as investors worried about the deal's impact on oversupply. Kansas City Fed President and voting member Esther George told CNBC that it was time to move ahead with