Which of the following transformation would not preserve congruence

I personally think it's C, but it could also be E, so.. idk for sure, sorry
Hope this helps tho!
~{Dunsforhands}

A)26•2=52there are 2 sides with the same length116-52=64the other 2 side have to be half of 64 each64/2=32the width is 32b)make two sentences about these steps because your teacher knows how you write and explain things.