The time dependence of the position of a particle of mass $m = 2$ is given by $\vec { r } t = 2 t \hat { i } - 3 t ^ { 2 } \hat { j }$. Its angular momentum, with respect to the origin, at time $\mathrm { t } = 2$ is:\\
(1) 36 k\\
(2) $48 \hat { i } + \hat { j }$\\
(3) $- 48 \hat{k}$\\
(4) $- 34 \mathrm { k } - \hat { \mathrm { i } }$