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It has long been thought that humans first crossed a land bridge into the Americas approximately 13,000 years ago. __________ based on radiocarbon dating of samples uncovered in Mexico, a research team recently suggested that humans may have arrived more than 30,000 years ago--much earlier than previously thought.

Which choice completes the text with the most logical transition?
Difficulty: Easy
A:

As a result,

B:

Similarly,

C:

However,

D:

In conclusion,

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