I need help on a geometry question. Pictures at the bottom

The first box choices are:
A. both points A and B lies on the fold
B. point C lies on the fold
C. point A coincides with point B
The second box choices are:
A. Point A
B: Point B
C: Point C
The third box choices are:
A. The other sides of line AB
B. Point C
C. Segment BC

Goodluck please show explanation thanks!