Answer:
The interjection is a part of speech which is more commonly used in informal language than in formal writing or speech. Basically, the function of interjections is to express emotions or sudden bursts of feelings. They can express a wide variety of emotions such as: excitement, joy, surprise, or disgust.
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The noun phrase in the sentence above is the first option - the gooey, chocolate fudge brownies.
You have to write the whole thing and not separate these words because they are intricately connected into one noun phrase, so you cannot say just fudge brownies because that's not the whole phrase.
Tasted perfect is a verb phrase, and topped with icecream is an adjective phrase.