[单选题]
99.25: Pioneering radio s qfdd;z 8wxo(yvq 662ptation KFKA started broadcasting 78 years ago ahrhh1xs94 o0lt 1.31 MHz on the AM di 04s rxo1h9hhlal. What is the approximate length of its radio waves?
A. 23 m
B. 230 m
C. 2300 m
D. 23,000 m
E. $3\times\:10^8m$
