The authors stated that human beings are generally not capable of managing more than:

• A. 6 to 10
• B. 2 to 4
• C. 11 to 15
• D. 20 to 25

Answer: (A)

This item tests the limit of short-term working memory: how many items a person can handle at once. The well-known finding is that people can hold about seven items, give or take two. So the practical upper bound is roughly six to ten items. When more information is presented than this, processing becomes difficult, recall fades, and errors increase. That’s why the range six to ten best fits the general limit. The other ranges are either too small to reflect typical capacity (two to four) or exceed what people can usually manage in working memory (eleven to fifteen or twenty to twenty-five). In practice, you can help by chunking information into meaningful groups to stay within this limit.