B.
In order to calculate the value of this expression, we need to use the following property:
[tex]a^{\frac{b}{c}}=\sqrt[c]{a^b}[/tex]
So we have:
[tex]25^{\frac{3}{2}}=\sqrt[2]{25^3}=25\cdot\sqrt[]{25}=25\cdot5=125[/tex]
Therefore the value of 25^(3/2) is equal to 125.
