【单选题】

Earlier this month, researcher KevinBeaver of Florida State University reported that he and his co-authors had identified genetic markers associated with academic achievement. In their study, published in the journalDevelopmental Psychology, the scientists found that young people who possessed particular forms of three genes were more likely to finish high school and go on to college than those who carried other forms of the genes. The newly found genes are involved in regulating the actions in the brain, and have been linked in other studies to levels of motivation, attention and intelligence.

It is true that in recent years, scientists have produced a growing number of studies linking the capacity to learn to specific genes.A、team at King’sCollege London, for example, has published several articles relating ability in mathematics to different varieties inDNA、Children who carried 10 or more of the "risk" genes identified by the researchers were nearly twice as likely to perform poorly in math, according to a 2010 study generated by the group. In another experiment, scientists reported that some individuals possess another two forms of genes involved in brain development that may make it easier for them to learn difficult languages likeChinese.
But scientists have long warned against attributing complex human behaviors to the action of a few genes--and learning is among the most complex things we do. The authors of these studies acknowledge this. "Mathematical ability and disability are influenced by many forms of genes generating small effects across the entire system of ability," writes SophiaDocherty, who heads the King’sCollege team. Moreover, environment matters, even in the context of genes:Docherty’s research finds that children with the "risk" forms of genes were especially likely to do poorly in math when they lived in chaotic homes and had negative, punitive(惩罚性的)parents. More generally research indicates that genetic factors account for about half of the elements in educational achievement.
We can conclude that ______.
A、environment matters are even more important in learning
B、more practice can make up the difference of genes
C、some people can never learn well no matter how hard they do
D、some one is born brighter than others