Older inventions had vast improvements made on them.
Subordinate.
"Once you finish your work" by itself is not a sentence, therefore it depends on the remaining.
Answer:
The answer would be C.
Explanation:
Though, the correct definition of a compound sentence is a sentence with more than one subject or predicate, independant clause's contain a verb, that isnt what we are looking for. The dependant clause contains a subject or predicate, therefore your answer would be C. If I'm not correct however, I would believe it to be D.
C. The quarterback scored in the fourth quarter
