In which situation are waves transmitted?
A. A light in a swimming pool comes on after dark to prevent
accidents in the water.
B. A reflective screen is put on a parked car's dashboard to keep the
car from heating up in sunlight.
C. A person wears earplugs to prevent hearing damage when fueling
a jet plane at the airport.
D. A patient wears a lead apron at the dentist's office when getting
teeth X-rays.