单选题 Parents have a legal ______ to ensure that their children are provided with efficient education suitable to their age.
[A] impulse [B] influence [C] obligation [D] sympathy

【正确答案】 C
【答案解析】obligation为“义务”之意，法律上的义务就是“legal obligation”，因此选C。impulse推动，驱使；influence影响；sympathy同情心。句意：父母有义务确保子女受到适龄的有效教育。