B is correct. " as a stand-alone sentence does not make sense.
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Ti?u C?mI think A and B are possible.No. Only B. In an existential there construction (There were ...) you can't have a definite reference. "Siberia's oldest forests" are specific forests you can see in real world. That's a definite reference. In contrast "millions of trees" is indefinite. We have no idea which trees in the world are being