Your Answer is

Correct Answer is K

Explanation

Since AB and EF are both perpendicular to AD, then AB//EF, option F is established

Because BED is a right angle, DE is perpendicular to BE, option G is established

ACB and ECF Opposite angles are equal to each other, option H is established

From options G and H, it can be deduced that the two triangles ACBECF are similar (three internal angles are all equal) option J is established

Because no triangle is given CED is an equilateral right triangle, option K is not valid