Answer: Total Task Chaining
Step-by-step explanation:
The total task chaining is one of the type of procedure that helps in completing the overall sequence process and also receive the reinforcement while completion of the given task.
The main objective of the total task chaining process in which the various types of Learner developing the prerequisite skills that helps in completing the given task and does not required any type of trail process.
According to the given question, the BCBA is basically wants to teaching the children the procedure of the washing hands and give a demonstration on this so the BCBA is using the total task chaining procedure.
Therefore, Total task chaining is the correct answer.