Answer: The correct answer is Angle 5
Step-by-step explanation: Please refer you the attached diagram for details.
The parallel lines r and c have been drawn and two other lines x and y intersect both parallel lines resulting in two triangles formed between both parallel lines.
At parallel line c, the angle formed by line x is angle 3 as shown. Also at parallel line r, the angle formed by line x is angle 5 as shown. Upon careful observation, angle 6 is congruent to angle 1 (opposite angles are equal). Also angle 3 is equal to angle 5 just as angle 2 is congruent to angle 4 (alternate angles are equal).
Therefore, the one congruent to angle 3 is angle 5 as shown in the diagram attached (alternate angles).