Final answer:
The intersection of the front wall and the ceiling forms part of one line, and the intersection of the right wall and the floor forms part of another line. These two lines are skew lines because they are not in the same plane and do not intersect.
Step-by-step explanation:
The answer to this question is option C) Line, floor.
Skew lines are lines that do not lie on the same plane and do not intersect. In the given scenario, the intersection of the front wall and the ceiling forms part of one line, and the intersection of the right wall and the floor forms part of another line. These two lines are skew lines because they are not in the same plane and do not intersect.