A student performed an experiment to investigate how temperature affects the volume of urine produced. Which row shows the experiment in which the environmental temperature was raised from $20\,^{\circ}\text{C}$ to $40\,^{\circ}\text{C}$, while every other condition remained unchanged?
- Abefore 60, after 60
- Bbefore 80, after 40
- Cbefore 120, after 145
- Dbefore 100, after 130