A. intended to show feeling. Example: Wow, you are right again! As you can see it's not preceded by preposition, nor it relates to another word in the sentence. It doesn't have to be followed by exclamation point (but often is). "Wow" in this case doesn't have exclamation point, it could but it's up to the person who wrote the sentence.
An interjection is always intended to show feeling .
The correct answer is A. intended to show feeling, as interjections are primarily used to express strong emotions. While they can be followed by an exclamation point, that is not always the case. Interjections do not require a grammatical relationship with other words in the sentence.
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