Anatomically modern humans first reached North and South America by crossing Beringia. So, option B is the correct answer.
A lot of recent discoveries have led us to find out how Modern Humans traveled from North to South America. Discoveries of a lot of archaeological sites in both areas have led us to find out that humans traveled by foot as well as on boats. This was through the Pacific Ocean and a now submerged territory on it called the Beringia.
It doesn't exist now but has a very major role in populating North America. A lot of people might have migrated there before and then went on to North America. So, option B is the answer.
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