The temperature in Vancouver was recorded over a period of four hours. The equation y= -2x+43 describes the temperature over this time, where y is the temperature in F and x is the number of hours since measurements started. Which of the following statements correctly describes the temperature? A. It was 43 F after four hours, and is dropping by 2 degrees per hour.

B. It was -2 F when the temperature was first measured, and is rising by 43 degrees per hour.

C. It was -2 F after four hours, and is rising by 43 degrees per hour.

D. It was 43 F when the temperature was first measured, and is dropping by 2 degrees per hour.