Final answer:
In Positive Psychology, two consistently emerging themes are gratitude and generosity, which contribute to increased well-being and health outcomes.
Step-by-step explanation:
In the tenets of Positive Psychology, one of the themes that consistently emerges in studies is the focus on gratitude and generosity. This field of psychology emphasizes aspects of human functioning that lead to a fulfilling life, including positive emotions and character strengths. Positive Psychology interventions have been linked to improved well-being and have been suggested to play a role in health-related outcomes, including stress reduction and the improvement of cardiovascular health.
Studies such as Rasmussen and Wallio's exploration of the health benefits of optimism exemplify the positive psychology's focus on characteristics like gratitude that contribute to an individual's overall well-being and health. Similarly, altruism is seen as a form of prosocial behavior in positive psychology, which aligns with the concept of generosity. Thus, the correct answer to the question is d. Gratitude and generosity.