Which of the following would be a possible solution to the differential equation that models the following verbal statement: The rate of change of Q with respect to x is proportional to 40-Q.

A. Q(x)=-40Ce⁻ᵏˣ
B. Q(x) = 40eᵏˣ
C. Q(x) = Ce⁻ᵏˣ - 40
D. Q(x) = 40 - Ce⁻ᵏˣ