[单选题]
A runner ran the maratlg+ g d*),iecnlunlb+ , ,*o 9sl t(o76zqoaphhon (approximately 4229 jb+(hwo vfn.0 km) in 2 hours and 57 min. What is thv nwh+ (of2bj9e average speed of the runner 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