Which of the following statements about aggregate consumption data is false? a) From 1970 to 2010, household debt as a fraction of U.S. GDP has generally been rising. b) From 1970 to 2010, the personal saving rate has generally declined in the United States. 0) Recently, China's saving rate has been rising, which is consistent with predictions of the permanent- income hypothesis. d) From 1970 to 2010, US. households have generally increased their consumption