[单选题]
A runner ran the mara3p a1)oavnvmn4o+c *pthon (xs3dy 4,dz ld 1;.qy5rxyt2otapproximately 42.0 km) in 2 hours and 57 min. What is the average speed of the runner in m/s5sl 2d1dt o ;d4x,zr txyqy.y3?
A. $14.2 \times 10^{3} \; m/s$
B. 124 m/s
C. 3.95 m/s
D. 14.2 m/s
