The correct answer of the given question above would be the second option. The statement that best identifies a lesson the reader can learn after reading "lifeguard rules" is that, although pools are fun, reckless behavior can be dangerous. Hope this answer helps.
1. Dependent clause: subordinate clause
2. Several insubordinate ideas strung together without punctuation: run-on
3. Has no subject or verb: phrase
4. One independent clause: simple sentence
5. Independent clause: main clause
6. One independent clause; one or more dependent clauses: complex sentence
7. Has a subject and a verb: clause
8. Two or more independent clauses; no dependent clauses: compound sentence
9. An incomplete sentence: fragment
10. Two or more independent clauses; one or more dependent clauses: compound-complex sentence
