A pedestrian crossing line meets two straight roads at points P and Q. The interior angles on the same side of the crossing at P and Q are found to be supplementary. What can be concluded about the two roads?
a) The roads are perpendicular because consecutive interior angles are supplementary.
b) No definite conclusion can be drawn about the roads.
c) The roads are parallel because consecutive interior angles are supplementary.
d) The roads are intersecting because consecutive interior angles are supplementary.