Final answer:
To prove that the two triangles are similar, we need either angle o to be congruent to angle p or angle m to be congruent to angle p.
Step-by-step explanation:
In order to prove that the two triangles are similar, we need the additional information that either angle o is congruent to angle p (option a) or angle m is congruent to angle p (option c).
Similar triangles have corresponding angles that are congruent, so in this case, if angle n is congruent to angle q, we also need either angle o to be congruent to angle p or angle m to be congruent to angle p in order for the triangles to be similar.