[单选题]
A runner ran the marathon (approximat: y6 lk+lqp/nhely 42.0 km) in 2glsj 8wg) anwa4tk /bme)4(d ,i1 +jnn hours and 57 min. What is t a)wtm lin)dn 1g+j/,4gbn8(es4kwaj he 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
