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【单选题】
男，7岁。因下颌牙齿排列不齐就诊。检查：下颌中切牙完全萌出，下颌侧切牙萌出2／3，远中切角舌侧扭转与乳尖牙重叠，侧切牙萌出间隙不足。此患儿现在处于的牙列时期为（）。A.
乳牙列时期
B.
混合牙列时期
C.
第一恒磨牙建 时期
D.
年轻恒牙列时期
E.
侧方牙群替换期
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