To answer this question, you need to understand the different parts of speech in the English language.
Option A) Verb - A verb is a word that expresses an action or a state of being. "CONFIDENTLY" is not a verb because it does not express an action or state of being.
Option B) Noun - A noun is a word that represents a person, place, thing, or idea. "CONFIDENTLY" is not a noun because it does not represent a person, place, thing, or idea.
Option C) Pronoun - A pronoun is a word that replaces a noun in a sentence. "CONFIDENTLY" is not a pronoun because it does not replace a noun.
Option D) Adjective - An adjective is a word that describes or modifies a noun. "CONFIDENTLY" is not an adjective because it does not describe or modify a noun.
Option E) Adverb - An adverb is a word that describes or modifies a verb, adjective, or another adverb. "CONFIDENTLY" is an adverb because it describes how the manager made his presentation, modifying the verb "made."
Option F) Preposition - A preposition is a word that shows a relationship between a noun or pronoun and another word. "CONFIDENTLY" is not a preposition because it does not show a relationship between words.
The correct answer is E) Adverb. This option is correct because "CONFIDENTLY" describes how the manager made his presentation, modifying the verb "made."