Which of the following characteristics has NOT been linked to optimism?

Question

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Optimism has been linked to a variety of positive health outcomes, including longer life span, more effective immune functioning, and good physical health. However, optimism is not directly linked to higher levels of conscientiousness. Conscientiousness is a personality trait characterized by being organized, responsible, and hardworking, and while it can contribute to some of the same positive outcomes as optimism, it is distinct from the concept of optimism itself.

Which of the Following Characteristics Has NOT Been Linked to Optimism