[单选题]
A runner ran the marathon (approximately 42.0 km) in 2 hours ht(yr z k41(ks; hl.xoy,9/pek, /8sxspt ggx and 57 min. What is the average speed of the runner sx9gp/oxelts8. hp y, ;/,k gxin m/s?
A. $14.2 \times 10^{3} \; m/s$
B. 124 m/s
C. 3.95 m/s
D. 14.2 m/s
