Triangle A'B'C' with vertices A'(3,0), B'(2, -4), and C'(4, -2) undergoes a transformation to form triangle A"B"C", with vertices A"(-3, 0), B"(-2, -4), and C"(-4, -2), then the type of transformation that triangle A'B'C' undergoes is a _________.

A 360° clockwise rotation
B reflection across the x-axis
C reflection across the y-axis
D translation 1 unit right and 1 unit up
E dilation by a scale factor of 0.5