单选题 Because this area has a high rate of crime and unemployment, there are only people moving out.
A. incentive B. incident C. incidence D. initiative

【正确答案】 C

【答案解析】[解析] 词义辨析
rate几率，比率，速度，费用；而B．incident事件，事变；C．incidence发生，影响(方式)，影响范围，影响程度，发生率；initiative主动性；因此C为答案。