Answer:
C: After the supplies are delivered and we finish the inventory we clean up, we can leave.
Step-by-step explanation:
We know this because the sentence has more than 1 independent clause; "the supplies are delivered" , "we finish the inventory", and "we clean up".
An independent clause is basically just a sentence. This run-on sentence could easily become three sentences. A sentence can sometimes have more than one independent clause and still be a proper sentence if it has proper punctuation. This sentence does not.