Correct option is B
The correct one-word for the given group of words is Optimist.
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Optimist: A person who always expects the best possible outcome and looks at the bright side of things. (हिंदी अर्थ: वह व्यक्ति जो हमेशा अच्छी चीज़ों की उम्मीद करता है और सकारात्मक दृष्टिकोण रखता है।)
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Example: Even after failing the exam, Rahul remained an optimist and prepared for the next attempt with renewed energy.
Meanings of the given other options:
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Saint: A person recognized for their holiness or virtuous behavior. (हिंदी अर्थ: पवित्र या धार्मिक व्यक्ति)
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Pessimist: A person who always expects the worst to happen. (हिंदी अर्थ: नकारात्मक दृष्टिकोण रखने वाला व्यक्ति)
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Scientist: A person who studies or practices science. (हिंदी अर्थ: वैज्ञानिक)