Step 1: Understand the key psychological concepts involved: self-doubt, resilience, coping strategies, self-esteem, and self-concept.
Step 2: Define self-doubt as a lack of confidence in oneself and one's abilities, often linked to negative self-evaluations.
Step 3: Recognize that high resilience and effective coping strategies generally help reduce self-doubt by enabling individuals to manage stress and challenges effectively.
Step 4: Understand that low self-esteem refers to a negative evaluation of oneself, which is closely associated with increased self-doubt.
Step 5: Conclude that among the options, low self-esteem is the most direct cause of self-doubt, while positive self-concept and high resilience typically counteract it.