[单项选择]

Young Female Chimps Outlearn Their Brothers

Young female chimps are faster and better learners than young male chimps, suggests a new study, echoing learning differences seen in human girls and boys.
While young male chimps pass their time playing, young female chimps carefully study their mothers. As a result, they learn how to fish for tasty termite snacks over two years before the boys.
Elizabeth Lonsdorf, now at Lincoln Park Zoo in Chicago, US, and colleagues at the University of Minnesota, Saint Paul, spent four years watching how young chimpanzees in the Gombe National Park in Tanzania learned "cultural behavior".
The sex differences in learning behavior were "consistent and strikingly apparent", says the team. The researchers point out that similar differences are seen in human children with regard to skills such as writing. "A sex-based learning differences may therefore date back at least to the last common ancesto
A. Because young female chimps don’t play with their brothers.
B. Because young female chimps begin to study their mothers earlier.
C. Because young male chimps never learn to fish for termites.
D. Because young male chimps are not interested in termites.