Reuters: British energy giant BP Plc on Tuesday announced plans to sell assets worth about $1.7 billion as it seeks to build up cash to pay for the worst oil spill in U.S. history. As British Prime Minister David Cameron sought to defend the energy giant before meeting President Barack Obama and U.S. senators, the energy company outlined its latest plans to raise money. Exactly three months after an explosion on an offshore rig killed 11 workers and caused millions of barrels of crude …