For what value of $k$ does the equation $3x^2+2x+k=0$ have real roots?

Question

$\begin{array}{1 1}(A) \; k >\large\frac{1}{3}\\(B)\;k \geq \large\frac{1}{3} \\(C)\;k < \large\frac{1}{3} \\(D)\;k \leq \large\frac{1}{3}\end{array}$