Since the two triangles are congruent (ΔABC ≅ ΔLMN), a true statement is that: D. BC ≅ MN.
The properties of similar triangles.
In Geometry, two (2) triangles are similar when the ratio of their corresponding sides are equal in magnitude and their corresponding angles are congruent.
Based on the side, angle, side (SAS) criterion, the true statement to prove that the two (2) triangles are congruent (ΔABC ≅ ΔLMN) is that side BC must be equal to side MN because angle ABC is equal to angle LMN.
Read more on congruency here: brainly.com/question/11844452
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