In grammar, an interjection is a word used to display emotions, such as surprise, glee, anger, etc. In this case the word "Yummy" is being used to display eagerness to enjoy the dinner that smells so unbelievably good.
Option A, "Yummy", is your correct answer choice.
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“Language is a medium of expression. Literature is a collection of expressions via language. Language is expressive as its purpose is to express ideas, knowledge, and opinions, whereas literature is more imaginative.”
Jack this is my friend, Harry
Hi Harry, nice to meet you
Hi Jack, nice to see you. bye