Read the following passage and questions, then choose the right answer from options, the answer should be one of A, B, C, D.

<passage>:
the current record, held by Algerian Noureddine Morceli, is 3:44 , more than 5 percent faster than Bannister's speed. What Iffley Road witnessed was just another step along the road to an ever quicker mile, part of the inexorable improvement of athletic performance that we usually take for granted, particularly when the Olympics roll around. If you stop to think about it, though, such constant progress is remarkable. After all, as biomechanical machines with a standard set of parts, humans should be subject to the same limitations we see in, say, automobiles. How come they aren't? Probably the most striking change, though, is how much more quickly children are maturing. A 12-year-old child in 1990 who was in what the World Health Organization calls "average economic circumstances" was about 9 inches taller than his or her 1900 counterpart. This is not solely the product of the first trend--the increase in average size--but also due to the fact that children develop faster. Girls menstruate earlier than they used to. The age of menarche (the onset of menstruation) has decreased by three or four months per decade in average sections of Western European populations for the past 150 years. There is a good chance that our 1990 12-year-old already had started to menstruate. Her 1900 counterpart would still have had three years to wait. What do such trends have to do with athletic performance? Well, if we're living longer and growing up faster, that must mean we're producing bigger, better bodies. Better bodies imply faster miles. We run faster and faster for the same reason it is now common for 11-year-old girls to menstruate. But why are these things happening? The decline of empire has its Olympic corollaries. Britain won, on average, 17 gold medals per Olympics in the five official games held in its imperial heyday before World War I. That average has dropped to only five medals per Olympics in the 17 held since. This is not a reflection of declining athletic standards in Britain, however it's a function of how much more competitive other nations have become. The Olympics originally were the preserve of the socioeconomic elite of the socioeconomic elite among nations. Consider this: Only 13 nations participated in 1896, but there were 172 in 1992. Black Africans didn't take part until the third modern games, held in St. Louis in 1908. Even this was accidental: Lentauw and Yamasami, Zulu tribesmen, entered the marathon because they happened to be in St. Louis as part of an exhibit about the Boer war. Lentauw finished ninth despite being chased into a cornfield by dogs. Since all these are changes in how we live, not anything innate, we have to conclude that what we are describing here are effects of environment, not genes. Let us assume that our 1900 and 1990 12-year-olds are identical twins magically born 90 years apart. The 1990 girl still will grow up faster, end up bigger, menstruate earlier, and live longer than the 1900 girl. Perhaps way, way back in human history, when our forebears were still fleeing saber-toothed tigers, natural selection for athletic prowess came into play. But all that ended long ago. Indeed, the laws of natural selection probably work against athletes these days: Given the rigors of training schedules, it is possible that today's top athletes have fewer children than average. Just because nurture has a more significant effect on athletic performance doesn't mean that nature lies dormant, though. Genetic variation exists for just about any trait you choose to study, and the ability to run quickly would be no exception. To take a trivial case, we know that the inheritance of extra fingers or toes is determined genetically. It is quite possible that the possession of an extra toe would hinder an aspiring miler--their genes have affected their athletic performance. One genetic factor that may be influencing performance trends is what is known as "hybrid vigor." Cattle breeders have known about this for a long time: Take two inbred lines of cattle, cross them, and what you have is "better" (say, larger) than any single individual in either of the two parental lines. This does not require natural selection it is the accidental byproduct of combining two previously isolated stocks. There are a number of theories to account for this at the genetic level, but it has proved difficult to discriminate among them. It is possible that modern humans exhibit some form of hybrid vigor simply because migration and admixture of populations are now occurring at unprecedented rates. Perhaps, just perhaps, such hybridization is being translated into enhanced performance. You can bring a single generation up to speed through training, but the trends we're dealing with transcend individual generations. Which brings us to another question: Will there come a time when the human machine will hit some sort of natural limit and an Olympic Games pass without a single record tumbling? In principle, yes. There are some barriers that simply cannot be broken. We will never run a mile at the same speed at which we now run 100 meters, for instance. The laws of oxygen exchange will not permit it. Race horses seem already to have hit that outer limit. For years, they were as good as human athletes at pushing back speed records, but then they simply stopped getting faster. Take the prestigious British Derby. From 1850 to 1930, winning times dropped from 2:55 to 2:39. But from 1986 to 1996, the average time has been--2:39. Unlike people, race horses are specifically bred and reared to run. Generations of careful genetic selection have ensured that today's race horse has every possible speed-enhancing characteristic. Training techniques, too, are tremendously sophisticated. But you can go only so far. You can only breed horses with ultralight thin bones to a certain point the bones will break under stress if they get any lighter. Human improvement, like race-horse improvement, must eventually bow to the basic constraints of biomechanics. The age of menarche cannot keep on falling forever. On the other hand, it is clear from the remarkable demographic changes of just the past 20 years that these long-term trends are with us still. They may be slowing down in some more developed societies, but they roar along in others. And these trends will continue to fuel the improvement in athletic performance. Several new records will be set in Atlanta. And in Sydney in 2000, and wherever the Olympics are held in 2044. We will continue running faster and jumping further for a good long while to come.

<question>:
When does the author think we will have an Olympics in which no new records are set?

<options>:
A Never
B At some point in the far future
C Within 20 years
D Within 40 years

<answer>:

B