Which of the following sentences contains an interjection, that is, a short exclamatory word expressing emotion?

Introduction / Context:
This grammar question is about interjections, which are short words or phrases that express strong emotion or reaction, such as surprise, relief, or sudden realization. Interjections are often followed by a comma or exclamation mark and are not grammatically connected to the rest of the sentence. The task is to identify which sentence uses such a word. This is a basic but important part of understanding sentence structure and expressive language.

Given Data / Assumptions:

• The candidate sentences are: "Hey, where did I park my car!", "Well, that is a relief.", and "Oh, now I remember where I put my wallet."
• The words "Hey", "Well", and "Oh" appear at the beginning of these sentences.
• The fourth option is "All of the above".
• We assume standard definitions of interjections in school level grammar.

Concept / Approach:
An interjection is a word used to express emotion or sudden reaction and is usually separated by a comma or exclamation mark. Common examples include "Oh", "Hey", "Wow", and "Well" when used as exclamatory reactions. In each of the first three sentences, the initial word fulfills this role. The remainder of each sentence forms a complete clause, while the interjection stands apart as a separate element. Since all three sentences contain such a word, the correct choice is "All of the above".

Step-by-Step Solution:
Step 1: Identify the first word in option a: "Hey". This is often used to call attention or express surprise.Step 2: Confirm that "Hey" is followed by a comma and an exclamatory sentence, which is a typical pattern for interjections.Step 3: Identify the first word in option b: "Well". In this context, it introduces a reaction to good news and can function as a mild interjection expressing relief.Step 4: Identify the first word in option c: "Oh". This word signals sudden remembering or surprise, which is a classic interjection.Step 5: Note that in each sentence, the interjection is not required for grammar but adds emotional expression.Step 6: Since options a, b, and c all contain interjections, option d "All of the above" must be the correct answer.

Verification / Alternative check:
Look at how these words function in other examples. "Hey, watch out!" uses "Hey" as an interjection to warn someone. "Well, that was unexpected" uses "Well" as an interjection to show reflection or mild surprise. "Oh, I see now" uses "Oh" to express sudden understanding. In each case, you can remove the interjection and the sentence still has a core meaning, such as "Where did I park my car?" or "That is a relief." This separate, emotional, and optional nature is typical of interjections, confirming their function in all three given sentences.

Why Other Options Are Wrong:
If you choose only one of options a, b, or c, you ignore the fact that the other sentences also contain interjections. Each initial word in those sentences clearly meets the definition of an interjection. Therefore, each single letter option fails to capture the full truth. The question is not asking you to pick just one example but to identify which of the listed sentences contain an interjection, and the correct response is that all of them do. Option d correctly reflects this.

Common Pitfalls:
Some students may think of interjections only as very strong exclamations like "Wow" or "Ouch" and may underestimate words like "Well". However, many grammars recognize "Well" as a mild interjection when it introduces a reaction rather than serving as an adverb of manner. Another pitfall is to focus on the presence of an exclamation mark and assume that only sentences with obvious excitement count. In reality, punctuation helps but is not the only sign. The safest method is to ask whether the word at the beginning expresses emotion or reaction and can be removed without affecting the main grammatical structure. On that test, all three sentences clearly contain interjections.

Final Answer:
The correct choice is All of the above, because each sentence contains an interjection at the beginning.