Oil Retreats After Closing Above $100 Wednesday February 20, 1:55 am ET By Thomas Hogue, AP Business Writer Oil Prices Retreat After Closing Above $100 a Barrel; Asian Stock Markets Rattled BANGKOK, Thailand (AP) -- Oil prices retreated Wednesday in Asia after closing above $100 a barrel for the first time overnight as investors seized on a refinery explosion and the possibility that OPEC may cut its output. The spike in crude prices Tuesday rattled Asian financial markets, with Tokyo's benchmark stock index falling more than 3 percent. Other factors lifting oil above the $100 mark were concerns about a...