option (C) is correct
we know the conversion that bit delay/Bandwidth => delay in sec and delay in sec*velocity => delay in meter
here Bandwidth(B)=10^7 bps , number of bits =1
propagation speed =200 meter/microsecond means in 1 microsecond 200 meter distance can be covered
= >in 1 second distance covered =>200*10^6 meter
=>propagation speed=2*10^8 m/sec
from above conversion,
delay in meter = (bits/B)*v =>(1/10^7 )*2*10^8 =>20 meter