<p>All elevators in the building are currently <strong>out of</strong> order due to a sudden power outage.</p>
<p>The correct answer is <strong>(C) out of</strong>.</p>
<p>The phrase "out of order" is commonly used to describe something that is not working or functioning correctly. In this case, the elevators are not working due to a power outage, so they are "out of order."</p>
<p>The other options are not grammatically correct or do not convey the intended meaning:</p>
<p>(A) "without" does not accurately describe the situation. It implies that the elevators are intentionally not equipped with something, which is not the case here.</p>
<p>(B) "in" is not the appropriate preposition to use in this context. It does not convey the meaning of being non-functional.</p>
<p>(D) "because of" is a prepositional phrase that can be used to explain the cause of something, but it does not fit well in this sentence structure. It would be more appropriate to use "due to" to indicate the reason for the elevators being out of order.</p>