The correct description of 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.
In mathematical terms, when a figure is dilated from the origin with a scale factor greater than 1, the new figure becomes larger, with each vertex moving away from the center of dilation by a distance that is scaled by the factor. In this case, the scale factor is 5, so each side of triangle ABC becomes 5 times longer, and each point of the triangle moves 5 times further away from the origin.