Answer:
B) 8.0 m
Step-by-step explanation:
First of all, we can find the frequency of the wave, which is equal to the number of waves that pass a given point per second. Therefore:

which means 1.25 waves/second.
Then we can find the wavelength of the water waves, which is given by:

where
v = 10.0 m/s is the speed of the wave
f = 1.25 Hz is the wave frequency
Substituting, we find
