Which Statement Summarizing Research on Whether Training Working Memory Skills

Multiple Choice

Which statement summarizing research on whether training working memory skills improves cognitive performance on non-memory related tasks is true?

A) Over 50 years of research has clearly demonstrated that training working memory increases overall cognitive performance.
B) Training working memory skills has not been shown to increase cognitive performance on non-memory related tasks.
C) More research is needed to determine if enhancing working memory leads to increased cognitive performance on non-memory related tasks.
D) Efforts to study this research question have been thwarted by the fact that working memory skills cannot be improved with training.