D. Weak winds that blow for short periods of time with a short fetch is your best answer choice.
Weak wind would need to blow for long periods of time to be able to generate enough force to create waves. However, option (D) states that it is "short period" of time, so it would negate it. Fetch, is described as "the length of the water over surface area based on the wind". If the fetch is short, then it would mean it is a relatively small wave.
