Geometry

The answer is B.

 

1. Recall the property of a mid - point:

A mid - point of a line segment divides the segment into two equal parts. That is, if  is the mid - point of segment , then the length of  is equal to the length of .

 

2. Analyze each figure:

For the first figure: There are no markings to show that , so we can't conclude that  is the mid - point of  from this figure.

 

For the second figure: The tick marks indicate that the three sub - segments between , , and  are of equal length. So, the length of  is equal to the length of , which means  is the mid - point of segment .

 

For the third figure: The points are arranged as ,

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