Oil prices fell in quiet trading Friday following the Thanksgiving holiday, a signal that crude could struggle to extend its recent rally in the final month of the year. U.S. crude futures fell 5.1% to $55.17 a barrel on the New York Mercantile Exchange, paring most of their November rebound and logging their biggest drop since mid-September. Prices are 17% below their April peaks. Brent, the global gauge of crude prices, dropped 2.3% to $62.43 a barrel on the Intercontinental Exchange after edging lower on Thursday when U.S….