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.
When you dilate a shape with a scale factor greater than 1 (like 5), the resulting shape (A′B′C′) becomes larger than the original shape (ABC), and the vertices of the new triangle are positioned further away from the center point of dilation compared to the original triangle.