[单选题]
A runner ran the marathon (approximatezr .nq24*pv2 xv /aeaely 42.0 km+live d;af7u wufb.1-) in 2 hours and 57 min. What is the average speed of the run fdue +1.fviawl-b7;uner 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
