Identify the option that can be substituted as the correct idiom for the underlined part of the given sentence.

My cousin sister Neetu had an aerial view of the trade fair from the top of the giant wheel.

The correct option is Bird’s eye view.

Step-by-step Explanation:
1. Analyze the underlined phrase: The sentence mentions an "aerial view of the trade fair from the top of the giant wheel." An "aerial view" is a view of an area from a high altitude, looking down.
2. Define the correct idiom: A "bird’s eye view" is a common idiomatic expression that describes a panoramic or elevated view of a scene from above, mimicking what a bird would see while flying. Thus, it is a perfect substitute for "aerial view" in this context.
3. Review the incorrect options:
- "A bird in the gilded cage" refers to someone who lives a luxurious life but has no freedom.
- "Birds of same feather" (commonly "birds of a feather") refers to people who share similar characters, interests, or backgrounds.
- "Bird brain" is an informal, derogatory term for a silly or foolish person.
Therefore, "Bird’s eye view" is the correct idiom to substitute for the underlined phrase.