Your client's skill acquisition plan includes increasing the frequency of appropriate greetings with peers. During a playdate at a friend's house, you observe the client greet their friend upon arrival and engage in play for 10 minutes. The client takes a break for 5 minutes to have a snack, initiates another greeting with a different peer, and engages in play for 8 minutes before taking a break for 3 minutes to drink water. What is the inter-response time for the appropriate greetings with peers? A) 10 minutes B) 26 minutes C) 15 minutes D) 8 minutes