Answer:
B). Intrinsic motivation.
Step-by-step explanation:
Intrinsic motivation is exemplified as the internal motivation(intrinsic rewards like pleasure, contentment, or gratification) that drives an individual to enact a specific behavior or do a particular activity. Such motivation encourages the individual intrinsically to perform an action that would bring him/her internal rewards.
As per the given description, the teacher's behavior is primarily inclined to thwart the 'intrinsic motivation' of Caroline in the form of 'joy that she attains after discovering the meaning of unknown words.' The teacher attempts to motivate or evoke a behavior through positive reinforcement in the form of rewards like 'gold star' that would eventually lead to undermining her 'intrinsic motivation'. Thus, option B is the correct answer.