Final answer:
The employee's paycheck is based on a fixed interval reinforcement schedule because it rewards her based on the time worked, not on the sales completed. The correct answer is option B.
Step-by-step explanation:
An employee at a shoe store who is paid $15 every hour she works, regardless of whether she sells a pair of shoes or not, is being compensated based on a fixed interval reinforcement schedule. This type of schedule rewards behavior after a set amount of time, not based on the number of sales or actions taken by the employee. It's similar to June recovering from surgery in hospital, receiving pain relief on a regular timed schedule. In contrast, a salesperson who earns a commission per number of sales, like the example of Carla selling glasses, is on a fixed ratio reinforcement schedule, as the reward is based on the number of responses or sales.