Question

informative introduction
? flight attendants make sure that passengers are safe and comfortable.
which background information should be added?
baggage claim is the area at the airport where passengers pick up their luggage.
training usually takes 6 to 12 months to complete.
have you ever wondered who takes care of you during a flight?

Explanation:

We need to find background info related to flight attendants' role. The first option is about baggage claim (unrelated to flight attendants' duties). The second is about training duration (not background for their role in passenger care). The third question ("Have you ever wondered who takes care of you during a flight?") introduces the topic of who attends to passengers, which is relevant as background to lead into the statement about flight attendants ensuring passenger safety and comfort.

Answer:

The correct option is: "Have you ever wondered who takes care of you during a flight?"