A, B, and C are the first three letters, so we will assume they make the first triangle. This will be called Δ ABC.
The next letters are D and E. There is no F as the third letter, but we actually don't need third letter to solve this.
Assuming ∠A has a different measure than ∠B and ∠C, but the triangles are still similar, we can draw the conclusion that ∠A ≅ ∠D.
The answer is A. ∠a and ∠d.
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