Answer is: D. Weak winds that blow for short periods of time with a short fetch.
Few factors determinate size of surfing waves:
1) Wind speed: the greater the wind speed the larger the wave.
2) Wind Duration: the longer the wind blows the larger the wave.
3) Fetch: the greater the area the wind affects the larger the wave.
So, strong winds that have been blowing for a long time with a long fetch will form biggest surfing waves.
