Answer:
The correct answer option is B. ∠XYZ.
Explanation:
In geometrical terms, an angle is the figure which is formed by two rays which are called the sides of the angle.
Here, for the described situation for a triangle XYZ, Y is the vertex with the side rays or sides of the angle YX and YZ.
Considering the sides of the angle, you can name the angle as either ∠XYZ or ∠ZYX or simple ∠Y without mentioning any side rays.