If 10 and 15 are the lengths of two sides of a triangular region, which of the following can be the length of the third side?
I. 5
II. 15
III. 20	Choose the correct choice from the following options.
A) I only  B) II only  C) I and II only  D) II and III only  E) I, II, and III
The length of any side of a triangle must be larger than the positive difference of the other two sides, but smaller than the sum of the other two sides.   Let x be the length of the third side.   15-10 &lt; x &lt; 15+10   5 &lt; x &lt; 25   The answer is II and III only.
<result>D</result>
If 10 and 15 are the lengths of two sides of a triangular region, which of the following can be the length of the third side?
I. 5
II. 15
III. 20