Incentive incompatibility means that in the principal-agent relationship, both the principal and the agent will guide their behavior with their own maximum benefits. Institutional arrangements make them inconsistent in their goals and behaviors. But there is no incentive for agents. According to the above definitions, which of the following is incentives incompatible? ['Unit A takes measures to enable each employee to achieve his or her own career in contributing more to the enterprise.', "There is a serious phenomenon of seniority in the promotion of company B's position.", "C. After purchasing medical insurance from an insurance company, he didn't work and rest as regularly as before, and started staying up late and drinking heavily.", 'The Ding Hospital implements an incremental commission system for doctors. The more registered orders a doctor receives each month, the higher the commission rate.']