Answer: A Cicadas live only one month.
Step-by-step explanation:
A sentence fragment is an incomplete sentence. Fragments are either made of dependent clauses, or lack subject/predicate. Complete sentences, on the other hand, have both the subject and the predicate, and are independent. It means that complete sentences can exist on their own.
The only complete sentence is Cicadas live only one month. This sentence can exist on its own, and contains both the subject and the predicate.