Answer
We can rank the choices of $\phi$ according to the average rate at which the waves will transport energy:
$0 \gt 0.2~wavelength \gt 0.5~wavelength$
Work Step by Step
When $\phi = 0$, the waves are in phase and there is fully constructive interference.
When $\phi = 0.5$, there is fully destructive interference.
We can rank the choices of $\phi$ according to the average rate at which the waves will transport energy:
$0 \gt 0.2~wavelength \gt 0.5~wavelength$