单选题:基牙的观测线是(  )。

题目内容:
基牙的观测线是(  )。 A.牙冠轴面最突点的连线,不随观测方向改变而改变
B.牙冠解剖外形最突点的连线,不随观测方向改变而改变
C.牙冠解剖外形最突点的连线,随观测方向改变而改变
D.牙冠轴面最突点的连线,随观测方向改变而改变
E.组织表面最突点画出的连线,不随观测方向改变而改变
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