The earliest inhabitants of the US arrived at least O 12,000 years ago O 900 years ago O 15,000 years ago O 14,000 years ago

Correct answer is 15 000 years ago.

Explanation:

The first option is correct answer as we have material evidences in the region of Bluefish Caves, that dates back to the period even as old as more than 20 000 years.

That is why all other options are false. Especially second option as in that period this territory was inhabited by numerous tribes. And of course, remaining two option are not correct also, as we said that it was inhabited much before that period.

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