Final answer:
The number of sets used in successful sitcoms varies greatly and is often tailored to the premise of the show. Sitcoms have evolved from using traditional family setups to less traditional and dysfunctional family portrayals over the decades.
Step-by-step explanation:
You asked about the number of main sets used in successful sitcoms. The answer is D) It varies greatly. Successful sitcoms have been filmed on a variety of sets, some using only one main set, while others use several. The choice of set often depends on the show's premise and format. For example, 'Seinfeld' primarily used Jerry's apartment, but it also featured secondary locations like the diner. Similarly, 'Friends' had a couple of key settings such as the apartments and the coffee house.
The family structures represented in these sitcoms have also evolved over time. In the 1980s, less traditional family structures in sitcoms gained popularity, breaking away from the conventional nuclear family setup. Shows like 'Diff'rent Strokes' and 'One Day at a Time' led this trend, followed by the portrayal of the dysfunctional family in later years with programs like 'Roseanne', 'Married with Children', and 'The Simpsons'.