Answer:
Entice means attract or tempt by offering pleasure or advantage. a
SYNONYM for the word entice would be lure which means to temp or temptation.
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The main reason why Franz Kafka, before his death, instructed his friend Max Brod to destroy all his unpublished manuscripts was because he didn't want his unfinished work to be read.