The line \(y=3\) is a horizontal asymptote to the graph of which of the following functions?

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To find the horizontal asymptote, compare the coefficients of the highest power term.

$$ y=\frac{15x^2+3x}{1+5x^2} $$ $$ \lim\limits_{x\to \infty} \frac{15x^2+3x}{1+5x^2} $$ $$ = \lim\limits_{x\to \infty} \frac{15x^2}{5x^2} $$ $$ = \boxed{3} $$