In ΔABC, the correspondence ABC ↔ BAC is similarity …….. of the following is true.

Given: In ∆ABC, the correspondence ABC ↔ BAC is similarity.

Now by definition, for a given correspondence between the vertices of two triangles, if the corresponding angles of the triangles are congruent and the lengths of the corresponding sides are in proportion, then the given correspondence is a similarity between two triangles.

∠A ≅ ∠B, ∠B ≅ ∠A and ∠C ≅ ∠C are all true.

Thus, option (c) is true.