If the task is too complicated to figure out on ______ own, please don't hesitate to ask one of our representatives, who are here to help.

【正确答案】 B

【答案解析】 本题需选择适当的代词。“on ______ own”是“介词+……+名词”结构的介词短语，横线处应填入修饰名词“own”的物主代词。“On one's own”表示“独立地”。