Which triangles could not be similar to triangle ABC ?Select each correct answer.

Solution:Similar triangles- Two triangles are said to be similar if the ratio of their corresponding sides are equal.Here, In five different triangles , triangle ABC, GHI and JKL have similar ratio of their correspondig sides .ratio of corresponding sides of triangle MNO and DEF are not similar to triangle ABC.Hence, triangle MNO and DEF are not similar to trianlge ABC.