[单选题]
A runner ran the marathon (approximately 4huy3rp 3;x)qy u ke9z*nbi(7 g2.0 km) in 2 hourj(wy c5 o85+.whnbiod p-n d:us and 57 min. What is the average speed of the runner in 5 -n ij boh+y8udc w5o.w:p(dnm/s?
A. $14.2 \times 10^{3} \; m/s$
B. 124 m/s
C. 3.95 m/s
D. 14.2 m/s
