Hyundai Motor Co., South Korea’s top automaker, didn’t report cash donations to two controversial foundations to its board two years ago, sources said Wednesday, sparking questions over managerial transparency. In October and December 2015, Hyundai Motor donated a combined 6.88 billion won to the foundations controlled by Choi Soon-sil, President Park Geun-hye’s friend at the center of a massive influence-peddling and corruption scandal that has led to Park’s impeachment.