It's doomsday according to the prophecys.
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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C the income level of visitors
Answer:
B) Ms. Humphrey turned left, she yielded to oncoming traffic.
Explanation:
Each phrase on either side of the comma are full sentences, with no connecting word between them
Hope this helps!