In each of the following sentences, a blank has been provided. Choose the most appropriate word from the given options to make the sentence grammatically correct and contextually meaningful. Despite possessing extraordinary technical expertise, the scientist remained remarkably ______ in public discussions, often attributing major breakthroughs to collaborative effort rather than individual brilliance.

The sentence highlights that: The scientist was highly skilled, Yet modest in public behaviour, Credited others instead of seeking personal recognition. Thus, the blank requires a word meaning: → humble or modest. “Unassuming” means: → modest, not arrogant, humble despite achievements. Why others are incorrect: Assertive = forcefully confident Flamboyant = showy and attention-seeking Confrontational = argumentative Rigid = inflexible Only “unassuming” captures the contrast between extraordinary expertise and modest conduct. Hence, option (a).