Here's why:
* "Class" is a plural noun, but it is used as a singular entity in this case (referring to a group of students).
* To make a singular noun possessive, we add 's to the end.
Therefore, the correct possessive form is "the class's test".
Here's why:
* "Class" is a plural noun, but it is used as a singular entity in this case (referring to a group of students).
* To make a singular noun possessive, we add 's to the end.
Therefore, the correct possessive form is "the class's test".