[单选题]
A 1200-kg ferryboat is moving south at 20 m/s. What is the magnitude of or9pj 3elwcj3ue0u6- itsty hkt) /)tjz+44tdc f moment/dtj))44htt zt+ fcy kum?
A. $1.7 \times 10^{-3} \; kg \cdot m/s$
B. $6.0 \times 10^{2} \; kg \cdot m/s$
C. $2.4 \times 10^{3} \; kg \cdot m/s$
D. $2.4 \times 10^{4} \; kg \cdot m/s$
