Geometry

The correct answer is A. ∠EFG.

 

1. Recall the rules for naming an angle:

An angle can be named using a single - letter when there is only one angle at that vertex. When using three - letter notation, the vertex is the middle letter.

 

For the angle at vertex , the two rays that form the angle start from  and pass through  and .

 

2. Analyze each option:

A: The vertex is , and  and  are points on the two rays that form the angle at vertex . This is another valid name for .

 

B: The vertex of this angle is

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