The answer is: [A]: Idiom.
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The phrase: "castles in the air" is an idiom.
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Explanation: "Castles in the air", literally speaking, are impossible to exist or be created.
So, when used as an idiomatic phrase, it refers to events that cannot, or likely will not, be possible to achieve.
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The answer is D. Quotations
1.Sport involves individual skills. In game, it is the collective responsibility of a team
2. Sport is based on physical energy and game based on mental strength.
3. Game relies on strategy, sport is based on individual performances and luck.
4. Sport is an activity or activities where the material capabilities of the sportsperson are looked upon. It is the entire performance of the players that determines the winner in a game.
An independent clause expresses a complete thought and can stand alone as a sentence, as opposed to a dependent one.
