Answer:
The correct answer is letter B. washing one's hair.
Step-by-step explanation:
Total task chaining means that the entire sequence of steps in a task must be completed. The behavior is reinforced after the completion of the steps. Notice how options A, C, and D do not concern the whole task, but only parts of it. Letter C, for instance, refers to forward chaining, since it is focusing on the first step - crossing the shoelaces - instead of the whole process of tying shoes. The option that refers to a total task is letter B. Washing one's hair includes all the steps - wetting the hair, applying shampoo, rinsing, applying hair conditioner, rinsing again. Reinforcement comes after the whole sequence is finished.