At noon, the temperature was 75LaTeX: ^\circ∘F. After cold front came through, by midnight the temperature dropped to 45LaTeX: ^\circ∘F. What was the rate of change in temperature? Group of answer choices

LaTeX: -30^\circ− 30 ∘− 30 ∘F

LaTeX: 30^\circ30 ∘30 ∘F

LaTeX: 5.5^\circ5.5 ∘5.5 ∘F

LaTeX: -2.5^\circ− 2.5 ∘F