A part of speech that can answer the questions "How?", "When?", "Where?", "To what extent?", and "How long?" is a(n): preposition adverb noun adjective
The correct answer to this question would be B, an adverb.
Explanation:
An adverb uses any word to alter an adjective, verb, or another adverb, which is often used to show time, place, manner, or degree. I hope this helps you :)
