This was already answer in your previous question !?!!??
A. The verb tense is always present tense in this sentence unlike the others.
In essence, the author is stating that the degree of diversity that exists in the United States is much greater than any other country in the world. Any time there is a lot of diversity, there is the potential for problems.
In texting we would (normally) not use proper grammar, but when we’re writing we normally use proper grammar sense someone important is more likely to read it
