Answer:
negative
Explanation:
The term reinforce means to strengthen, and is used in psychology to refer to any stimulus which strengthens or increases the probability of a specific response.
Negative Reinforcement can be seen as the act of taking something negative away in order to increase a response.
Julie runs 2 miles every day after school because it reduces the stress (negative) she feels from school work (in order to increase her response in her school work).
