Mashaal Masha
Humans were long thought to have begun occupying the Peruvian settlement of Machu Picchu between 1440 and 1450 CE. However, a team led by anthropologist Dr. Richard Burger used accelerator mass spectrometry to uncover evidence that it was occupied ________ 1420 CE, according to Burger, humans were likely inhabiting the area.

Which choice completes the text so that it conforms to the conventions of Standard English?
Difficulty: Medium
A: 

earlier. In

B: 

earlier, in

C: 

earlier, which in

D: 

earlier in

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