Which model or theory and related research evidence,in particular,suggest the importance of influencing a person's self-efficacy in encouraging him or her to make a healthy lifestyle change?

A) health belief model
B) theory of planned behavior
C) stages of change model
D) transactional model

The theory of planned behavior suggests that a person's motivation to make a behavior change is influenced by their attitude towards the behavior, subjective norms, and perceived behavioral control, which includes self-efficacy. Research has shown that enhancing self-efficacy can increase the likelihood of healthy behavior change. Therefore, influencing a person's self-efficacy is important in encouraging him or her to make a healthy lifestyle change.