Answer: ∠C ≅ ∠E
Explanation:
If Δ ABC is congruent to Δ DEF, then its corresponding parts must be congruent.
segment AB ≅ segment DE [first two letters]
segment BC ≅ segment EF [last two letters]
segment AC ≅ segment DF[first and last letters]
∠A ≅ ∠D [first letter]
∠B ≅ ∠E [mid letter]
∠C ≅ ∠F [last letter]
so from the given options, the only statement that is not true is ∠C ≅ ∠E.