[ A ] 18 unit 

[ B ] 12.5 unit  
[ C ] 12 unit  
[ D ] 14 unit 
[ A ] 18 unit 

[ B ] 12.5 unit  
[ C ] 12 unit  
[ D ] 14 unit 
Answer : Option B 
Explanation : 
7, 24, 25 is a Pythagorean triplet. Therefore, the given triangle is a right angled triangle.In a rightangled triangle, the median to the hypotenuse is half the hypotenuse and is also the circumradius of the triangle.As the hypotenuse is 25, the circum radius is 12.5 
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