The correct option is
C
Option (A):
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1519153/original_Reupload_%281%29.png)
A right-angled triangle must have an angle that measures 90°.
In triangle ABC, none of the angles is equal to 90°.
So, this is not a right-angled triangle.
Option (B):
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1520727/original_123.PNG)
An obtuse-angled triangle must have an angle that measures more than 90°.
In triangle PQR, none of the angles is greater than 90°.
So, this is not an obtuse-angled triangle.
Option (C):
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1520728/original_123.PNG)
An acute-angled triangle must have all angles measuring less than 90°.
In triangle XYZ, all angles measure less than 90°.
So, this is an acute-angled triangle.
∴ Correct choice is
Option (C).