Which statement describes a reflection?
 A. 
A reflection occurs when a point and its image are equidistant from a line on the opposite sides of the line and the line segment joining the two points is perpendicular to the line.
 B. 
A reflection moves points a specified distance along a line perpendicular to a specified line.
 C. 
A reflection occurs when an object moves in a circular arc around a point.
 D. 
A reflection moves points a specified distance along a line parallel to a specified line.