Wow, that was a fast car! Which of the following parts of speech is the word "Wow" in the sentence above?
A. Preposition
B. Conjunction
C. Adverb
D. Interjection
The word “wow” can certainly be marked as an interjection as the word is in use to show the emotion of “surprise” of the speaker about the ability of the addressed person to qualify the hurdle in the first attempt.
Therefore, the Correct Answer is D.