Question id 21 - Preflight Procedures - FAA PPL(A) - Private Pilot Airplane

The pilot in command must instruct the passengers to keep their safety belts fastened for the entire flight.
The pilot in command has no obligation in regard to passengers' use of safety belts.
The pilot in command must brief the passengers on the use of safety belts and notify them to fasten their safety belts during taxi, takeoff, and landing.

Training tests and timed exam simulations FAA PPL(A) - Private Pilot Airplane