The following adverbs relating to when adverb is momentarily.
Option B is correct.
What is an adverb?
An adverb is the one which can change the sentence, verb or any adjective and usually showed with 'ly' at the end.
According to the provided adverbs, the when adverb is representing the time. The momentarily would be the right one describing that adverb. The sadly word indicates the state of being sad, mostly indicates the frequently or commonly and the monthly indicates the intervals of time.
Therefore, the adverb in option B describes the when adverb.
Learn more about the adverbs in the related link:
https://brainly.com/question/8554630
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