在下列极限结果中，正确的是【 】.A. lim_(x to 0) (xy)/(x^2 + y^2) = 0B. lim_(x to 0) (x^2 y)/(x^2 + y^2) = 0C. lim_(x to 0) (xy)/(x + y) = 0D. lim_(x to 0) (x^2 y)/(x + y) = 0

A. $\lim_{x \to 0} \frac{xy}{x^2 + y^2} = 0$

B. $\lim_{x \to 0} \frac{x^2 y}{x^2 + y^2} = 0$

C. $\lim_{x \to 0} \frac{xy}{x + y} = 0$

D. $\lim_{x \to 0} \frac{x^2 y}{x + y} = 0$