The diagram presents the findings from an experiment that used leaves from two different plant species with the same surface area. Each leaf was placed on a balance in daylight inside a closed room, and its mass was measured at $1$ hour intervals. Which characteristics of leaf $2$ might account for these results?
- A1, 2 and 3
- B1, 2 and 4
- C1 and 4 only
- D2 and 3 only