[单选] To absorb a younger work force, many companies offered retirement plans as incentives for olde

句意为：为吸引更年轻的劳动力，很多公司为老员工退休提供退休计划作为鼓励，以便为工资较低的年轻员工让路。incentive“激励，鼓励”，四个选项：reward“奖赏”；opportunit,／“机会”；motive“动机，目的”；stimulus“刺激物”；所以A项符合题意。