Which option best represents a keyword search?

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In keyword searching, the goal is to name the topic with the smallest set of content words that uniquely identify what you’re looking for. This means sticking to the essential nouns and concepts and avoiding full questions or filler words.

The option with vaccine effectiveness variants uses exactly those topic terms: vaccine, effectiveness, and variants. Together they point to the subject of how well vaccines perform against different variants, which is the kind of concise, topic-focused query that search systems can match most efficiently.

The other options read like natural-language questions and include function words (who, how much, are, which, etc.) and everyday terms (tickets, opera, athlete, pay). Those elements make the query broader or shift the focus away from a specific topic, so they’re less effective for a clean keyword search.