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题目： 单选题如图所示，M、N为电量相等的正电荷，XY为MN的垂直平分线，0为MN的中点。某重力不计的正电荷Q位于O点，先将Q向上移动很小距离后释放，电荷Q将沿YX直线运动，它在运动过程中，（）。
A加速度逐渐变小
B电场强度逐渐变小
C所受电场力逐渐变大
D电场强度先变大，后变小
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