3 歲兒童的哪項評估發現應令護理師對其精細動作發展感到擔憂？

核心概念：3 歲兒童的精細動作發展里程碑。 為何正確答案對： B. 3 歲兒童應能堆疊至少 9-10 個積木（Stack about 9 to 10 blocks）。若僅能堆疊 3 個，則表示其精細動作發展（Fine motor development）可能遲緩，需要進一步評估。 為何其他選項錯： A. 3 歲兒童通常還無法獨立繫鞋帶（Tie shoelaces），這是較為複雜的精細動作，通常在 4-5 歲左右學會。 C. 3 歲兒童可能開始能模仿畫圓圈（Copy a circle），但若無法做到也非絕對異常，需要結合其他發展指標評估。 B. 3 歲兒童可能開始學習使用安全剪刀（Use safety scissors），但其操作可能仍不協調，若無法使用也非絕對的嚴重遲緩。

Core concept: Fine motor developmental milestones in a 3-year-old child. Why the correct answer is right: B. A 3-year-old should be able to stack at least 9-10 blocks (Stack about 9 to 10 blocks). The ability to stack only 3 blocks suggests that fine motor development may be delayed and requires further evaluation. Why the other options are wrong: A. A 3-year-old is generally not yet able to tie shoelaces independently; this is a more complex fine motor skill that is typically acquired around 4-5 years of age. C. A 3-year-old may begin to be able to copy a circle, but inability to do so is not absolutely abnormal and should be evaluated in conjunction with other developmental indicators. D. A 3-year-old may begin to learn to use safety scissors, but their handling may still be uncoordinated; inability to use them is not necessarily indicative of severe delay.