What schedule of reinforcement is this? Shanna is a fifteen year old youth with Intellectual Disabilities that attends an ABA center afterschool, where she completes homework and practices daily living tasks. Shanna works for tokens, which she exchanges for money to spend at the ABA store once a week. The BCBA instructs the ABA staff to give Shanna a token for about every 4 tasks completed. Group of answer choices continuous fixed ratio fixed interval variable ratio