Before doing the answer , we should know some properties of triangles ;
- Scalene Triangle :- It's a triangle in which all sides of the respective triangle are different from each other
- Isosceles Triangle:- :- It's a triangle in which two sides are equal while the 3rd side is different
- Equilateral Triangle :- It's a triangle in which all sides are equal
Now , Checking for Triangle A :-
As , it's all sides are of equal length 16 , So option 3) Equilateral ✓
Now , Checking for Triangle B :-
As , it's all sides are of different length , So option 1) Scalene ✓
Now , Checking for Triangle C :-
As , it's all sides are of different length , So option 1) Scalene ✓