Answer:
a decrease in her intrinsic motivation.
Step-by-step explanation:
According to self-determination theory, the impact of this reward system is likely to be a decrease in her intrinsic motivation of reading books and writing short stories. The self-determination theory states that it is vital for psychological well-being to be in control of one´s destiny. So, the impact of this reward can only be detrimental to Nikki's intrinsic motivation for reading books and writing short stories. Being extrinsically rewarded makes intrinsic motivation decrease.