Final answer:
The subject of the question is cultural exchange. Cultural exchange refers to the sharing and interchange of ideas, customs, beliefs, and practices between different cultures or societies.
Step-by-step explanation:
The subject of the question is cultural exchange. Cultural exchange refers to the sharing and interchange of ideas, customs, beliefs, and practices between different cultures or societies. In this case, Larry and Megan Smith living in Swarthmore, PA may engage in cultural exchange by using their new video camera to document and share their experiences with people from different cultures.