Before an armed robber locked Mary Graves in the sweltering trunk of her car, she dialled an emergency number on her portable telephone and slipped it to her three-year-old daughter. Though confused, the little girl saved the day. She told emergency operators that her mother was locked in the trunk. Although she did't know where she was, she sprovided some important clues: she could see airplanes and the sky, according to the transcript of the emergency phone call. The operator called Tampa international airport police, who searched the top floor of the airport parking garage where the car was parked. The operator told the girl to honk, enabling the police to locate the car and free Mrs. Graves.
Through the passage, the write suggests the importance and utility of

Options

A. education of little children
B. parking garages
C. portable telephones
D. airports