This question is incomplete since you did not provide the passage. Anyway, I will give you an explanation that will help you understand the central ideas of a text.
Explanation:
The central idea of a text is its main argument. In other words, it is the most important information you want to convey.
Here are some tips to help you correctly identify the central idea:
Each paragraph contains its own main idea or content. A detailed reading is necessary and clearly analyze what each paragraph transmits to us
It is common to answer the question: What is the paragraph about? What is the general meaning of the text? What does the author want to communicate?
The central idea synthesizes the information that the author wants to convey.
Although some texts may have the main idea explicitly, sometimes it is not.
There are secondary ideas and main ideas throughout the text. Sometimes they may be a bit confused and an interpretation task on the part of the reader is important.
I think its an Idiom. I don't see like or as. So no simile. I don't see he is something like a marshmallow. - No metaphor. I also don't see a non-human thing doing human things- the grass was dancing in the wind. My answer would be an idiom.
