Step 1: Understanding positive attitude.
A positive attitude helps individuals stay motivated, optimistic, and productive in different situations.
Step 2: Evaluating options.
- (A): True. Positive attitude improves happiness.
- (B): True. It strengthens relationships.
- (C): Incorrect. Positive attitude actually increases chances of success.
- (D): True. It helps in making better decisions.
Step 3: Conclusion.
Thus, the option not related to positive attitude is
(C).
Final Answer:} It decreases one's chances of success.