Answer: Matter don't matter
Explanation:
Ok actually matter is basically anything. It has mass, sometimes volume etc.
I do not believe everyone should speak English. I think it is important for ( like you said ) culture and diversity to remain constant throughout the world. It might help communication, but I believe we have sufficient tools to help us communicate right now anyways. So it’s not a necessity or something we should enforce.
The answer to your question is THEME
It is called falling action.
It’s A. Changes in art, architecture, fashion and other fields.