A coolant is injected into engine fluid, causing the temperature of the engine fluid to decrease with respect to time at a rate that is proportional to the difference of the fluid's instantaneous temperature, T, and the fluid's original temperature, To. Select the differential equation that represents the relationship. (10 points) O di = c(T - To) O d1 = c(T. -T) O T = t (T - To) O T=t (To - T)