Ricardo and Paula are working on puzzles in their preschool. Ricardo sits and works on puzzles for a half an hour without moving whereas Paula spends only a few minutes on a puzzle before walking off to see a friend. This difference between Ricardo and Paula reflects which aspect of their temperament according to Mary Rothbart?单项选择题

题目图片
A

approach

B

activity level

C

rhythmicity

D

attention span

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