患儿，女性，8岁，因前牙反<img src="/Image1/20/209d039037793a279d79976fa8299152.jpg" />就诊。口内观牙齿数目正常，排列整齐，上下切牙反<img src="/Image1/20/209d039037793a279d79976fa8299152.jpg" />，反覆盖浅，反覆<img src="/Image1/20/209d039037793a279d79976fa8299152.jpg" />中度，切牙可后退至对刃，磨牙近中<img src="/Image1/20/209d039037793a279d79976fa8299152.jpg" />。口外观矢状向轻度凹面型，垂直向为均角面型。可能引起该患儿前牙反<img src="/Image1/20/209d039037793a279d79976fa8299152.jpg" />的因素中，哪项描述是正确的（）<br>A:遗传因素<br>B:上乳前牙早失<br>C:乳尖牙磨耗不足<br>D:伸舌习惯<br>E:以上全部