If x and y are positive integers, and x^3*y^4 = 10125, which of the following is the value of xy? Choose the correct choice from the following choices:
A) 6  B) 10  C) 14  D) 15  E) 21
10125 = 3*3375 = 3^2*1125 = 3^3*375 = 3^4*125 = 3^4*5^3   xy = 3*5= 
<gadget id="calculator">3*5</gadget>
<output>15</output>
15   The answer is 15.
<result>D</result>
If x and y are positive integers, and x^3*y^4 = 10125, which of the following is the value of xy?