三角形内到三条边的距离相等的点是( )
A:三角形的三条角平分线的交点
B:三角形的三条高的交点
C:三角形的三条中线的交点
D:三角形的三边的垂直平分线的交点
—Because his classmates often make fun of him because of his stammer(口吃).