(D) Negative thoughts
Negative thoughts do not help in stress management. Techniques like healthy food, sound sleep, and yoga asanas are recommended to reduce stress.
Source: Stress Management, Chapter 2
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The passage clearly states under Positivity: "Focussing on negative aspects of life will add more stress." In contrast, healthy diet, sleep (7 hours), and yoga/meditation are all listed as stress management techniques. Examiners expect the correct option with a one-line justification.