Answer:
(A) Right
(B) Obtuse
(C) Equilateral
(D) Isosceles
A right triangle must contain a right angle and two acute angles.
An obtuse triangle must contain an obtuse angle and two acute angles.
An equilateral triangle must be 60 degrees in every corner, and thus there are 2+ acute angles.
An isosceles triangle can have two angles that are 30 degrees (thus two acute), and a 120 degree angle.
