Correct Answer & Explanation
Option B
• 'Fidelity' denotes faithfulness, loyalty, or devotion to a person, cause, or belief.
• Synonyms: Allegiance, loyalty, devotion, trustworthiness.
• 'Treachery' is an antonym, whereas 'Fluctuation' and 'Unsteadiness' mean instability.
• Therefore, option B ('Allegiance') is the correct answer.