Question

In a geometry class, the students were asked to prove the theorem below by contradiction:

Theorem: In a quadrilateral, there cannot be more than three obtuse angles.

Heather begins the proof with an assumption. Which statement will she most likely use as an assumption?

Let one angle of a quadrilateral be acute and the other three angles obtuse.

Let all angles of a quadrilateral be obtuse.

Let only one angle of a quadrilateral be obtuse.

Let one angle of a quadrilateral be obtuse and the other three angles acute.