Which pair of angles is NOT congruent? (A) angle1 and angle7 ( B ) angle3 and angle5; (C) angle4 and angle6; (D) angle2 and angle5

Congruent angles simply refer to those angles that are the same size.
The rules for congruent angles with parallel lines and transversal are that the angles must be:
1) Alternate Interior Angles
2) Alternate Exterior Angles
3) Corresponding Angles
4) Vertical Angles.
Now, let us check each option individually:
OPTION A: Angles 1 and 7
Angles 1 and 7 are alternate exterior angles.
Therefore, they are CONGRUENT.
OPTION B: Angles 3 and 5
Angles 3 and 5 are alternate interior angles.
Therefore, they are CONGRUENT.
OPTION C: Angles 4 and 6
Angles 4 and 6 are corresponding angles.
Therefore, they are CONGRUENT.
OPTION D: Angles 2 and 5
Angles 2 and 5 do not have any particular relationship with each other.
Therefore, they are NOT CONGRUENT.
Hence, OPTION D is correct.