Final answer:
The given sentence is an example of a passive sentence, with the subject being the enchiladas.
Step-by-step explanation:
The given sentence, "The enchiladas that were prepared by Aunt Flora were enjoyed by the entire family," is an example of a passive sentence. In this sentence, the emphasis is on the action being done to the enchiladas (i.e., being enjoyed by the entire family), rather than on who is performing the action. The subject of the sentence is "the enchiladas."
Learn more about Identifying active and passive sentences