Answer:
During the party, Mrs. Saint-Claire served pizza on paper plates to the children.
Step-by-step explanation:
The correct sentence is -. During the party, Mrs. Saint-Claire served pizza on paper plates to the children.- Because it is explaining that what Mrs. Saint-Claire served on paper plates was the pizza. Besides, the clause Mrs. Saint-Claire served pizza on paper plates to the children, can stand on its own since the verb serve needs a direct object/complement and an indirect object. In this case, the direct object is pizza, and the indirect object is the children. In the original sentence, the verb serve lacks its direct object.