Answer:
It is relevant and sufficient, because she gives convincing examples of how phones support classwork.
It believe the answer is the second choice, "have a subject and a verb."
Independent clauses are complete sentences, which knocks out the third and fourth option.
Dependent clauses are not complete thoughts, knocking out the first option.
<span>The best answer for this question would be: Do not obstruct fire doors and shutters. It is important to keep this in mind because, the safety of the people is on the line. Blocking the doors would mean a danger zone. So it is important to keep it open for everyone to exit.</span>