Question

what best shows the recent common origin of humans and chimpanzees?
a similarities in their dna sequences
b similar arm and hand bones
c fossil record

Explanation:

DNA contains genetic information. Similar DNA sequences indicate a closer evolutionary relationship. Similar arm and hand bones (b) could be due to convergent evolution or less specific. Fossil record (c) might not be as precise as DNA for showing recent common origin.

Answer:

A. similarities in their DNA sequences