When a triangle is dilated by a scale factor, each side is multiplied by the same factor and angles are not modified. So the dilated triangle is a similar, larger triangle. So, the options b, c, and d are true, while option b, that the sides ABC are congruent to the sides of A'B'C' is not true. Congruent means equa and, when you dilate by a scale factor of 3, the sides will not be equal but larger. Then the answer is the option b.
