There is a sentence that is missing in the paragraph below. Look at the paragraph and decide where (option 1, 2, 3, or 4) the following sentence would best fit.
Paragraph: The researchers also uncovered an unexpected genetic link between Native Americans and Japanese people ___ (1) ___ . During the deglaciation period, another group branched out from northern coastal China and travelled to Japan ___ (2) ___ . "We were surprised to find that this ancestral source also contributed to the Japanese gene pool, especially the indigenous Ainus," says Li ___ (3) ___ . They shared similarities in how they crafted stemmed projectile points for arrowheads and spears ___ (4) ___ . "This suggests that the Pleistocene connection among the Americas, China, and Japan was not confined to culture but also to genetics," says senior author Qing-Peng Kong, an evolutionary geneticist at the Chinese Academy of Sciences.
Sentence: The discovery helps to explain archeological similarities between the Paleolithic peoples of China, Japan, and the Americas.
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