单选题:(  )是出生后头半年婴儿认知发展的重要里程碑,也是手的真正触觉探索的开始。

题目内容:
(  )是出生后头半年婴儿认知发展的重要里程碑,也是手的真正触觉探索的开始。 A.手的无意抚摸
B.手的抓握反射
C.手脚并用爬行
D.眼手协调动作的出现

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