Motivation explains why people act or behave in a certain way to achieve goals.
It can come from within a person or from external sources.
When people are driven by their own interests, curiosity, or satisfaction, this is called intrinsic motivation.
However, when the drive comes from outside — like getting a reward, bonus, praise, promotion, or any other benefit — it is called extrinsic motivation.
The question clearly mentions 'incentives or external rewards', which directly relates to extrinsic motivation.
Therefore, the correct answer is option (B).