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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A. That she is ashamed of how poor her family is
Answer:
Fluency: being able to speak or right in a foreign language fluently.
Flexibility: being able to bend without breaking.
Originality: thinking of something that is creative and not used before.
Elaboration: to explain into more detail.
Answer: Being a good writer is just being able to write down complex thoughts in a clear way.
Explanation:
