Parents have a legal______to ensure that their children are provided with efficient education suitable to their age.
【正确答案】
C
【答案解析】obligation指法律或道义上的义务或责任，例如：a legal obligation to serve inthe armed forces(服兵役的法律义务)。impulse意为“驱使，推动”，如：the impulse ofcuriosity(好奇心的驱使)。influence意为“影响”；sympathy意为“同情心”。