Because each child is unique so they each act differently and do stuff/complete stuff in different ways
Sorry if wrong hope this helps
When it comes to what motivates us, it usually falls into one of two categories: intrinsic or extrinsic. Intrinsic motivation is when you're motivated to complete a task because of personal goals or rewards, and extrinsic motivation is when you complete a task to either avoid punishment or earn a reward.
D. The appearance of the odd people