Passage #5         The following excerpt is adapted from an article written by James D. Watson, co-discoverer of the structure of DNA and Nobel Prize laureate of medicine.         Though most forms of DNA manipulation are not effectively regulated now, one important potential goal remains blocked. Experiments aimed at learning how to insert functional genetic material into human germ cells sperm and eggs-remain off limits to most of the world's scientists. No governmental body wants to take responsibility for initiating steps that might help redirect the course of future human evolution. These decisions reflect widespread concerns that we, as humans, may not have the wisdom to modify the most precious treasures of all human beings-our chromosomal "instruction books." Dare we be entrusted with improving upon the results of the several million years of Darwinian natural selection? Unlike many of my peers, I'm reluctant to accept such reasoning because we should not postpone experiments that have clearly defined future benefits for fear of dangers that can't be quantified. ... Moving forward will not be for the faint of heart. But if the next century witnesses failure, let it be because our science is not yet up to the job.
45. What best describes James Watson's main idea in this passage?
(A) Governments are not encouraging scientists to study evolution
(B) Darwin's idea of natural selection cannot be challenged by genetic experiments.
(C) Human beings are not yet ready to handle the consequences of experiments on chromosomes.
(D) Politics is hindering scientific progress that may bring benefits to future generations.