it has long been thought that humans first crossed a land bridge into the americas approximately 13,000…

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.\nwhich choice completes the text with the most logical transition?\nchoose 1 answer:\na as a result.\nb similarly,\nc however,\nd in conclusion,

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.\nwhich choice completes the text with the most logical transition?\nchoose 1 answer:\na as a result.\nb similarly,\nc however,\nd in conclusion,

Answer

Brief Explanations:

The first sentence states the long - held belief that humans crossed into the Americas about 13,000 years ago. The second part presents a new finding (more than 30,000 years ago) which is contrary to the initial belief. "However" is used to show a contrast.

  • "As a result" implies a cause - effect relationship which is not present here.
  • "Similarly" indicates similarity, but the two statements are different (old vs new belief).
  • "In conclusion" is used to sum up, but this is not a conclusion of previous points.

Answer:

C. However.