Let k be a positive real number. If one root of the equation
$$3 x ^ { 2 } + k x - 2 = 0$$
is k, what is the other root?\\
A) $\frac { \sqrt { 2 } } { 3 }$\\
B) $\frac { 2 \sqrt { 3 } } { 3 }$\\
C) $\frac { - 2 \sqrt { 2 } } { 3 }$\\
D) $\frac { - \sqrt { 2 } } { 6 }$\\
E) $\frac { - \sqrt { 3 } } { 6 }$