Answer: Maturation; learning
Explanation:
Not all children are ready to be toilet trained at the same time. Some get to that level faster than others. To begin toilet training, the child would have to have matured enough to know when they have bowel movement as well as how to stay dry. When this happens, they are ready for training.
Sometime, toddlers can learn from family members or people they are around what it means to use the toilet by watching them. This can therefore influence the time that a toddler can be toilet trained.
