Final answer:
Schools are using positive reinforcement by offering incentives like bus passes to encourage students at risk of dropping out to stay engaged with their education.
Step-by-step explanation:
The strategy that schools are using to offer material incentives such as bus passes, restaurant vouchers, and movie passes to students at risk of dropping out is best described as d) Positive reinforcement. This term, within the context of operant conditioning, refers to the addition of a stimulus after a desired behavior is exhibited, making that behavior more likely to occur in the future. Examples include rewarding students for attendance or performance, much like paying second-grade students in Dallas for reading books and taking quizzes to improve reading comprehension.