Final answer:
The initial time interval for DRO should be challenging based on the individual's baseline rate of the behavior. Therefore the correct answer is A. One that is challenging for the individual to meet based on the baseline rate of the behavior.
Step-by-step explanation:
The initial time interval that is selected for the Differential Reinforcement of Other Behavior (DRO) procedure should be A. One that is challenging for the individual to meet based on the baseline rate of the behavior. The purpose of DRO is to decrease a target behavior by reinforcing the absence of that behavior for a specified period of time. The interval should be set in a way that presents a challenge to the individual but is achievable based on their current behavior.