单选题 Unilever, one of the world's largest consumer products companies, aims to add ______ to life by meeting everyday needs for nutrition, hygiene and personal care.
A. agent B. remain C. vitality D. leaven

【正确答案】 C
【答案解析】[解析] agent“代理(商)”；remain“保持，剩余，残存”；vitality“活力，生命力”；leaven “酵母，潜移默化的影响”。