Angle 2 and angle 4 are vertical angles, which are opposite each other when two lines intersect, sharing the same measure and being congruent. Here option A is correct.
Vertical angles are two angles that are opposite each other when two lines intersect. They have the same measure and are congruent.
Adjacent angles are two angles that share a common vertex and a common side, but do not overlap. They are next to each other.
Complementary angles are two angles that add up to 90 degrees. They form a right angle when put together.
Supplementary angles are two angles that add up to 180 degrees. They form a straight angle when put together. Here option A is correct.