The three nations that are explored most of the United States are the France, Spain and England.
Why the three nations are explored in the United States?
The three nations were explored by the United States, that are France, Spain and England. The main reason of exploring that nations was that there were many mines that were found in the United Stated.
These three mines engaged the huge supply of gold, diamond and many more precious ornamental things.
Therefore, options B, C, and D are correct.
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