The answer is C because it is telling you to subtract 180 degrees from 54 degrees to get the final answer which is 126 I got that because 54 is that angle and it is asking for the whole amount so it would be C
It is an alternate angle as it is not equal and it is is not on the same side like corresponding angles and interior angles are. If the angles are on same side of a parallel line then the angles are considered consecutive. If they are on opposite sides, then the angles are considered alternate. Are the angles inside or outside of the two intersected lines? If they are inside the two lines, then they will be classified as interior.
