To prove that the opposite angles of a parallelogram are congruent, the following statements are relevant:
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B. Angle Addition Postulate - This postulate can help in establishing relationships between angles when two angles are adjacent to each other.
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C. Corresponding parts of Congruent Triangles are Congruent - This is also important in proving the congruence of angles when triangles are formed by the diagonals of the parallelogram.
The other options are less directly applicable for proving the congruence of opposite angles:
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A. Segment Addition Postulate - While this postulate is helpful in many geometric proofs, it is not specifically necessary for proving that opposite angles of a parallelogram are congruent.
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D. Corresponding Parts of Similar Triangles are Similar - This is not needed since we are dealing with congruence, not similarity.
Therefore, the necessary choices for proving that the opposite angles of a parallelogram are congruent would be B and C.