【正确答案】 B

【答案解析】[解析] 本题考查推理判断。从文章第二段中的句子：“The report concludes that children in school-based after-school programs benefit both academically and socially in programs that offer a diverse set of activities．”可以看出这一结果支持的是后者，即本段末“…such skills can be taught in a variety of program activities such as art，sports，book and chess clubs．”因此选[B]。