Final answer:
The key premise of Bandura's theory of self-efficacy relates to the belief in one's self-efficacy as crucial for changing health behaviors. This reflects a psychological approach to health where personal beliefs play an essential role in motivating and regulating health actions.
Step-by-step explanation:
Albert Bandura's theory of self-efficacy is central to understanding how people respond to health-related behaviors. The major premise of this theory is that an individual's belief in their own capacity to execute behaviors necessary to produce specific performance attainments is critical. Among the options provided, the correct one reflecting a major premise of Bandura's theory is c. Belief in self as having the ability to improve health is important in changing health behaviors. Self-efficacy influences how people think, feel, motivate themselves, and act. It is not just about understanding the risks and benefits, having a "cue to action", or genetics predetermining health outcomes; rather, it is the personal belief in one's own effectiveness in carrying out a course of action that can lead to improved health outcomes and behavior changes.
Furthermore, Bandura's work on reciprocal determinism and observational learning further explains how behavior, cognitive processes, and situational context all influence each other. This interconnectedness shows how self-efficacy is part of a broader cognitive and behavioral process concerning health and personal actions towards it.