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Answer:
The teacher packed picnic lunches for all the students--which they loved--and ate lunch outside with them at recess.
The sentence that contains a non-restrictive clause and is punctuated correctly is the teacher packed picnic lunches for all the students—which they loved-and ate lunch outside with them at recess.
What is a nonrestrictive clause?
A nonrestrictive clause adds more information about the sentence, it tells more about the proper person or thing.
When this clause is written, a punctuation is added, which can be a dash or a comma.
Thus, the correct option is A, the teacher packed picnic lunches for all the students—which they loved-and ate lunch outside with them at recess.
Learn more about nonrestrictive clauses
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