Indirect proof help.

Question

anonymous · Answer

Here it is:
If a polygon has four sides, it is a quadrilateral. 
If the opposite angles of a quadrilateral are congruent, it is a parallelogram. 
Beth constructed a quadrilateral in the geometry class.

anonymous · Answer

I am supposed to find a valid argument for those statements.
The choices are:

It can be concluded that Beth drew a rectangle.

It can be concluded that Beth drew a parallelogram.

It cannot be concluded that Beth drew a quadrilateral with opposite angles congruent.

It cannot be concluded that Beth drew a polygon with four sides.

anonymous · Answer

I just find this question confusing, especially the format in which the indirect proof is written.

anonymous · Answer

@skullpatrol