Among the stock activity stories for Tuesday, Dec. 6, from AP Business News:
— Shares of restaurant chain operator Darden Restaurants Inc. fell after the company lowered its fiscal 2012 guidance partly because of difficulties at its Olive Garden chain and because cost increases outweighed price hikes.
— Shares of oil and gas services company Halliburton Co. fell after BP accused it of destroying evidence related to the Deepwater Horizon blowout last year as the companies move closer to a trial that will determine who will pay which bills from the nation's worst offshore oil spill.
— Shares of Tesoro Corp. fell after a Credit Suisse analyst cut his rating for the oil refiner, saying that other companies in its sector currently offer better returns.
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