Explanation:
when it is phrased like that it should mean that we apply the scale factor to the original images to create the new ones.
and that means the new images will in our case be bigger by the factor of 2.
therefore, the 4th answer option is correct.
2 cm turn into 2×2 = 4 cm
1.5 cm turn into 2×1.5 = 3 cm
3 cm turn into 2×3 = 6 cm