Which sentence from the text BEST reveals the benefits of the Human Genome Project? A Scientists involved in the project have already finished mapping, or "sequencing," DNA molecules, showing the location of genes. B One of the unexpected findings is that it turns out people have far fewer genes than scientists thought. C Another interesting finding is that although groups of people around the world may look different, they are actually very similar genetically. D By studying how these genes work, medical researchers can try to improve treatments.