问题：
[单选题]无牙颌患者，戴全口义齿半月。每天戴义齿时间较长后感觉面颊部酸胀。检查：患者鼻唇沟变浅，说话时人工牙有撞击声。导致上述问题的原因是（ ）。
A、息止颌间隙过大
B、垂直距离过高
C、垂直距离过低
D、颌间距离过大
E、颌间距离过小
参考答案：
B
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