[单选题]
A runner ran the marathon (approximately w a 9deg0y tfucw2l(9;42.fejez+pak kb7)id99 ld :,f/d)urs *j0 km) in 2 hours and 57 min. What is the average speed of the run+*dsej9l,dj d f9:k7 kaefui b/)pzr) ner in m/s?
A. $14.2 \times 10^{3} \; m/s$
B. 124 m/s
C. 3.95 m/s
D. 14.2 m/s
