If the rotational kinetic energy of a body is $10 \ J$,and its angular momentum vector coincides with the axis of rotation,and its moment of inertia about this axis is $8 \times 10^{-7} \ kg \ m^2$,then the angular momentum of the body will be:
- A$4 \times 10^{-3} \ kg \ m^2/s$
- B$2 \times 10^{-3} \ kg \ m^2/s$
- C$6 \times 10^{-3} \ kg \ m^2/s$
- DNone of the above
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