What is the meaning of the idiom "Bird’s eye view"?

A general view from above.

The answer is A general view from above.

The idiom "bird's eye view" refers to a view of something from a very high vantage point, as if you were a bird flying overhead. This type of view allows you to see a large area all at once, which can be helpful for getting a general overview of something. For example, if you want to see the layout of a city, you might take a helicopter ride to get a bird's eye view.

The opposite of a bird's eye view is a worm's-eye view, which is a view from below. This type of view is often used to convey a sense of being small or insignificant. For example, if you are lost in a forest, you might feel like you have a worm's-eye view of the world.

The other options you listed are not correct meanings of the idiom "bird's eye view." A specific opinion, sharp sight, and visualization are all possible meanings of the phrase "bird's eye view," but they are not the most common meanings.