题目内容
（请给出正确答案）
[主观题]
The author states that "On the average, people can keep about seven ideas in their minds a
t once" to explain that ______.
A．most decisions involve seven steps
B．human mental capacity has limitations
C．some people have difficulty making minor as well as major decisions
D．people can learn to keep more than seven ideas in their minds with practice
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