What action did Julio take regarding his vacation?

Julio's action regarding his vacation is accurately reflected by the choice indicating that he returned last night. This indicates that he has completed his vacation and has come back to his original location or responsibilities. The phrase suggests a definitive ending to the vacation rather than any future plans or changes to the duration. This choice provides a clear, straightforward statement about his immediate situation regarding the vacation.

The other options mention actions or intentions that are not aligned with the context of returning; they imply future actions or changes that have not occurred at the time of Julio's return. Thus, the choice of returning last night succinctly captures the action he took.