Interjection is a part of speech that expresses strong emotions or sudden feelings. It is used to convey surprise, joy, excitement, pain, or any other intense emotion. In the given options, the interjection is represented by option 'C', which is "Wow".

Explanation:
Interjections are words or phrases that are used to express strong emotions or sudden feelings. They are not grammatically related to the rest of the sentence and often stand alone or are followed by an exclamation mark. They are used to add emphasis, express surprise, or convey a particular emotion.

In the given options, let's analyze each one to determine which one is an interjection:

a) And: "And" is a conjunction that is used to connect words, phrases, or clauses. It is not an interjection because it does not express a strong emotion or sudden feeling.

b) Although: "Although" is a subordinating conjunction that is used to introduce a subordinate clause expressing a contrast or concession. It is not an interjection because it does not convey any strong emotion or sudden feeling.

c) Wow: "Wow" is an interjection. It is used to express surprise, wonder, or astonishment. It is a standalone word that conveys a strong emotion.

d) Because: "Because" is a subordinating conjunction that is used to introduce a reason or cause. It is not an interjection because it does not convey any intense emotion or sudden feeling.

Therefore, the correct answer is option 'C', "Wow", as it is an example of an interjection.