The correct description for the dilation of triangle ABC, with a scale factor of 5 and a center point of dilation at the origin (0, 0), is:
Triangle A′B′C′ is 5 times as large as triangle ABC and is 5 times as far from the center point of dilation.
This is because a scale factor of 5 means that the sides of the new triangle (A'B'C') will be 5 times longer than those of the original triangle (ABC), and since the dilation is centered at the origin, the vertices of the new triangle will be 5 times further away from the origin compared to the vertices of triangle ABC.