The answer is D. Is difficult for many to understand because there are cultural backgrounds where people are taught different ways to say the term.
"between the two countries"
A prepositional phrase needs to contain a preposition, in this case it would be "between". As well it needs to modify the sentence and it should mention the object of the sentence. So "between the two countries" is correct.
Changing the wallpaper can help enhance the appearance of your computer's desktop, please change the subject to what your asking which is technology.
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