A rational algebraic expression (that which uses fractions and algebraic expressions inside them) is undefined if the the denominator is equal to 0.
For the rational expression:
[tex]\frac{x^3y^5}{16x^2y^3}[/tex]
The denominator is:
[tex]16x^2y^3[/tex]
If x=0, the denominator is equal to 0 because any expression multiplied by 0 is equal to 0.
Therefore, the correct choice is option B) 0.
