Final answer:
Without specific information about angles and sides of the triangles, it is not possible to accurately determine which postulate or theorem applies to proving ∠SEA ≅ ∠PEN. In mathematics, answers are based on defined postulates and theorems for reliability.
Step-by-step explanation:
To determine which postulate or theorem can be used to prove that ∠SEA ≅ ∠PEN, we need to look at the information given about the angles and sides of the triangles involved. However, the question does not provide specific information on side lengths or other angles associated with ∠SEA and ∠PEN. Without additional context, it is not possible to positively identify the correct postulate or theorem (A. Angle-Angle (AA), B. Side-Angle-Side (SAS), C. Angle-Side-Angle (ASA), D. Side-Side-Side (SSS)). Generally, the AA postulate is used in similarity proofs but not congruence, SAS and ASA postulates are used to prove congruence of triangles, and SSS postulate is another congruence postulate that requires knowing all three sides. To be reliable, answers in mathematics must be based on postulates and theorems, with trigonometry being a typical example due to its logical consistency derived from postulates.