Final answer:
Daniel, being quiet and reflective, preferring not to draw attention to himself, aligns with Carl Jung's definition of an introvert, making him a reserved person.
Step-by-step explanation:
Based on the description provided in the scenario, Daniel would be best described as a reserved person. This characterization fits with psychologist Carl Jung's definition of introversion, where individuals may be quiet and reflective, and prefer solitary activities or settings where they do not draw much attention. Jung's theory is pivotal in personality psychology and contrasts reserved, or introverted, individuals with those who are extroverted, who seek out social interactions to gain energy. Therefore, the correct answer here is (c) Reserved.