Why was Duane Jr. at home when Dr. Dressler visited?

The context of the situation reveals that Duane Jr. was engaged in doing his laundry at home when Dr. Dressler visited. This implies that he was likely handling personal responsibilities and was not occupied with other commitments, such as school or extra-curricular activities, which would explain his presence at home during the visit. Doing laundry is a task often associated with being home, as it requires access to laundry facilities and the time to take care of it.

While other options present various reasons why a person might be at home, such as being grounded or sick, the specific action of doing laundry aligns better with a typical scenario where someone is home for a practical reason rather than due to a penalty or health issue. The mention of a doctor's appointment suggests that he would have been away from home instead. Therefore, the reasoning in choosing the option that states he was doing his laundry stands strong due to its straightforward nature in relation to being at home.