The temperature in Minsk was recorded over a period of four hours. The equation y = -5x + 54 describes the temperature over this time, where y is the temperature in degrees Fahrenheit (°F) and c is the number of hours since measurements started. Which of the following statements correctly describes the temperature?

A: It was 54°F after four hours, and it is dropping by 5 degrees per hour.
B: It was -5°F when the temperature was first measured, and it is rising by 54 degrees per hour.
C: It was -5°F after four hours, and it is rising by 54 degrees per hour.
D: It was 54°F when the temperature was first measured, and it is dropping by 5 degrees per hour.