Geometry

The answer is D.

 

1. Recall the property of a mid - point:

A mid - point of a line segment divides the segment into two equal - length sub - segments. So, if is the mid - point of segment , then .

 

2. Analyze each figure:

First figure: The points are , , . There is no point , and   is the mid - point of (as shown by the tick marks), not . So this figure does not illustrate the statement.

 

Second figure: The tick marks show that , which means is the mid - point of , not being the mid - point of .

 

Third figure: The order of points is ,

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