It looks near perfect. Without knowing the context it's hard to say for sure but just make sure there is more than one type of interference that exists between A and B. If there is only one type of interference which is getting stronger then you would be better using the singular of interference. e.g. "more interferences exist between" compared to "more interference exists between" Like I said, Without knowing the full context or understanding the specific subject I can't know the right answer, But I suspect "more interference exists between" may be more suitable if there is only one source of interference. e.g. A strong interference or lots of interference is still pluralized as interference. It's only when you have multiple sources that it becomes interferences. Like if my WiFi at home is losing signal because of interference from my mobile phone and microwave at the same time, Then I would probably say there are interferences.

it's so difficult to answer!!!

안녕하세요, Chang. Yes, this sentence is correct. The grammar is a little tricky in these structures, so well done.