Answer:
[tex]\boxed{\mathrm{A}}[/tex]
Step-by-step explanation:
An obtuse triangle is a triangle with one obtuse angle and two acute angles.
An obtuse angle is an angle greater than 90 degrees.
An acute angle is an angle less than 90 degrees.
Angle C is an obtuse angle, it is greater than a right angle or 90 degrees.
Angles B and A are acute angles, they are less than a right angle or 90 degrees.
