In a geometry class, the students were asked to prove the theorem below by contradiction.
Theorem: A triangle has at the most one obtuse angle.
Heather begins the proof with an assumption. Which statement will she most likely use as an assumption?
Let each angle of a triangle be acute.
Let two angles of a triangle be obtuse.
Let two angles of a triangle be right.
Let only one angle of a triangle be obtuse.

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