Final answer:
The individual is at the pre-conventional level of Kohlberg's model of moral development because their decision-making is based on the expectation of rewards.
Step-by-step explanation:
The individual in the scenario is engaging in decision-making based on the expectation of rewards for their actions, specifically maintaining a clean desk and recycling to increase the chances of a promotion. According to Lawrence Kohlberg's theory of moral development, this reasoning is indicative of the pre-conventional level. In this stage, moral reasoning is primarily based on direct consequences to oneself, such as rewards or punishments, rather than on societal norms or ethical principles.