Answer: First option (incribed in the circle).
Step-by-step explanation:
As you can see in the figure shown in the problem, the triangle is inside of the circle and each vertex of that triangle touches the circle.
Then, by definition, we know that when a shape is incribed in a circle, then all the vertices of that shape must lie on the circle.
Therefore, keeping the above on mind, you can conclude the triangle is inscribed in the circle.
The answer is the first option.
