Explanation:
A common noun is a general name for a person, place, or thing. It does not refer to a specific or particular person, place, or thing. On the other hand, a proper noun is the name of a specific person, place, or thing and is always capitalized.

Comparison of options:
To determine whether school is a common noun or a proper noun, let's compare it to the definition of each option.

a) Common noun: A common noun is a general name for a person, place, or thing. Since school is a general name for an educational institution where students are taught, it fits the definition of a common noun. Additionally, school is not capitalized in this context, which is another indication that it is a common noun.

b) Proper noun: A proper noun is the name of a specific person, place, or thing. While there are specific schools with proper names, such as "Harvard University" or "Oxford University," the word "school" on its own is not a specific name. Therefore, it does not fit the definition of a proper noun.

c) Appositive phrase: An appositive phrase is a noun phrase that renames or provides additional information about a noun. However, the word "school" in this context is not being used as an appositive phrase.

d) Possessive noun: A possessive noun shows ownership or possession. For example, "student's book" or "teacher's desk." However, the word "school" in this context is not indicating possession or ownership.

Conclusion:
Based on the definitions and comparisons, it can be concluded that the correct answer is option 'A' - Common noun. School is a general name for an educational institution and does not refer to a specific or particular school.

Comman noun