Geometry

The correct answer is A.∠CBA.

 

1. Recall the angle - naming rule:

When an angle is formed by two rays  and , the common endpoint of these two rays is the vertex of the angle. Here, the common endpoint is point , and in the three - letter angle - naming convention, the vertex is placed in the middle.

 

The first letter represents a point on one ray, and the last letter represents a point on the other ray.

 

2. Analyze each option:

A: The vertex is , and  and  are points on the rays  and  respectively. This is the correct name for the angle formed by  and .

 

B: In this name, the vertex is , but the vertex of the angle formed by

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