The correct answer is a Concurrent schedule A concurrent schedule is specifically designed for situations where an individual has access to two or more independent schedules of reinforcement simultaneously and can choose which schedule to respond to This type of schedule is directly associated with the concept of choice and is fundamental to understanding the Matching Law which describes how organisms distribute their responses among available options The text explicitly links concurrent schedules with choice and the Matching Law stating concurrent is what were looking for concurrent is associated with Matthew law Its associated with choice where we have two different schedules operating and youre able to choose based on the response requirement the reinforcement delivered et cetera Etc Tandem schedules Option A are associated with chain schedules where components occur in a specific order with little to no choice as indicated by the text stating Tandem and chain there really isnt much choice right because things have to happen in some sort of order Conjunctive schedules Option B require that both a ratio and an interval schedule be met regardless of choice making them unsuitable for directly promoting choice conjunctive says both schedules must be met so regardless of choice you still need to meet both schedules Mixed schedules Option C present different schedules in a random unsignaled order within the same environment offering no true choice between distinct simultaneously available options Mixed says things these schedules occur random so youre not choosing