To determine the congruent corresponding angles in triangles \( \triangle MNO \) and \( \triangle RTS \), we first list the angles in each triangle:
For triangle \( MNO \):
- \( m\angle M = 78^\circ \)
- \( m\angle N = 34^\circ \)
- \( m\angle O = 68^\circ \)
For triangle \( RTS \):
- \( m\angle S = 68^\circ \)
- \( m\angle R = 78^\circ \)
- \( m\angle T = 34^\circ \)
Now, we can pair the angles based on their measures:
- \( \angle M \) in triangle \( MNO \) measures \( 78^\circ \) and corresponds to \( \angle R \) in triangle \( RTS \) since they both measure \( 78^\circ \).
- \( \angle N \) in triangle \( MNO \) measures \( 34^\circ \) and corresponds to \( \angle T \) in triangle \( RTS \) since they both measure \( 34^\circ \).
- \( \angle O \) in triangle \( MNO \) measures \( 68^\circ \) and corresponds to \( \angle S \) in triangle \( RTS \) since they both measure \( 68^\circ \).
Thus, the pairs of congruent corresponding angles are:
- \( \angle M \cong \angle R \)
- \( \angle N \cong \angle T \)
- \( \angle O \cong \angle S \)
This matches with the option: ∠M≅∠R, ∠N≅∠T, ∠O≅∠S.