The correct option is SYMBOL.
A symbol refers to an object or character which is used as a conventional representation of an object, process or function. Symbol is a thing which stands for another thing.
In the question given, the flag stands for United States of America.
The word is a preposition
She is understanding and regretful
Assonance was used in lines 3 and 4.
Assonance is when sounds of vowels are repeated to create a sense of despair.
Hope this helped and pls mark as brainliest!
~Luna