The correct answer is option 'A', which states that Tommy is a proper noun.

Proper nouns are used to refer to specific people, places, organizations, or things. They always begin with a capital letter.

- Tommy is a specific name given to a dog, so it is a proper noun.

Proper nouns are used to distinguish one particular item from others of the same type. In this case, "Tommy" is a specific dog, and using it as a proper noun helps to identify and differentiate it from other dogs.

Proper nouns can include names of people, such as "Tommy," as well as names of places, organizations, and even specific events or periods in history. They are unique and individual.

In contrast, the other options are not correct:

- Option 'B' states that Tommy is a proper noun, which is incorrect. "Dog" is a common noun, as it is a general term used to refer to any member of the canine species. It does not refer to a specific dog, but rather to the entire category of animals.

- Option 'C' suggests that Tommy is a collective noun, which is also incorrect. Collective nouns are used to refer to a group or collection of people, animals, or things. Examples of collective nouns include "team," "herd," and "flock." Tommy is not a word that represents a group or collection.

- Option 'D' claims that Tommy is a common noun, which is also incorrect. Common nouns are general names given to people, places, things, or ideas. They do not refer to specific individuals or entities. Examples of common nouns include "dog," "book," and "chair." However, in this case, Tommy is a specific name and therefore considered a proper noun.

In summary, Tommy is a proper noun because it is a specific name given to a particular dog. It begins with a capital letter and helps to identify and distinguish that dog from others.

Tommy is a specific name of a dog .