Final answer:
The words 'Hey! Ouch! Wow!' are examples of interjections. They express sudden or strong feelings and are often followed by an exclamation mark. They are not grammatically related to the rest of the sentence but convey emotions.
Step-by-step explanation:
The group of words that are examples of interjections is B) Hey! Ouch! Wow! Interjections are words that express sudden or strong feeling and are often found at the beginning of a sentence, followed by an exclamation mark or a comma when the feeling is not as strong.
For example, the word "Hey!" is an interjection because it's used to attract attention or express surprise. Similarly, "Ouch!" expresses pain, and "Wow!" shows amazement or excitement. These words stand out because they don't have a grammatical relationship with the rest of the sentence; instead, their main function is to convey the speaker's emotional response.
Certainly, neither A) over, against, beside nor C) so, as, if are interjections, as those are prepositions and conjunctions, respectively, which have different roles in sentence structure.