Self-monitoring is a personality attribute that entails the capacity to keep track of and control one's appearance, feelings, and actions in response to social contexts and circumstances.
As per the given question, it is seen that al the 4 candidates have a distinct quality that distinguishes them from each other. Tobias is although likeable, cooperative or understanding, he does not have the ability to self-monitor himself based on only these three factors.
Robin is introvert and still she is capable of interacting with client and team members efficiently. But an introvert person is not sociable to an extent outside the walls of her company. Therefore, she also lacks the quality of self monitoring.
As seen from the question, Martin is very sociable and very extrovert in nature which might later be a problem for him as he might not be able to keep him under control of his socialistic activities.
Therefore, the best person for the promotion would be Charlie, because he is aware of his surroundings and also self-monitoring is not being only social but also adhering to the needs of the organization. Charlie is aware of his project deadlines and is able to meet them on time and along with it, he is also creative and imaginative.
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