Pronoun to refer to "Mrs. Jeffrey's class" — "it" or "them"? [duplicate]

Possible Duplicate:
Which pronoun refers to a group …

Helping my sister with 3rd-grade homework, feel silly for checking.

She wrote:

The candy was brought by Mrs. Jeffrey's class. The candy was brought by them.

I corrected her with this:

The candy was brought by Mrs. Jeffrey's class. The candy was brought by it.

She wouldn't stop saying how it sounded weird. But I believe this is the right choice. Can anyone confirm?

Both it and them can be used to refer to the class. It depends on whether you want to think of the class as a collective whole or as distinct individuals.

It's ridiculous that this question would be given to a third grader. For the third grader, it depends on which prescriptive rule the teacher is using. Otherwise, both are correct. See the entry for notional agreement in Merriam Webster's Dictionary of English usage.