In the given figure, if AS = 10 cm, SN = 5 cm, and TN = 8 cm, which of the following could be the positive difference...

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Ques fig.jpg
In the given figure, if AS = 10 cm, Sn = 5 cm, and TN = 8 cm, which of the following could be the positive difference between the maximum and minimum value of AT, if all the sides shown in the figure are positive integers?

A. 16
B. 18
C. 20
D. 21
E. 23

OA C