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?

ALet each angle of a triangle be acute.

BLet two angles of a triangle be obtuse.

CLet two angles of a triangle be right.

DLet only one angle of a triangle be obtuse.