The response that best explains the difference in cultural practices between coastal and mountainous regions is:
"Coastal regions often develop a culture centered around fishing and trade, while mountainous regions may emphasize isolation and self-sufficiency."
This explanation reflects how geography influences access to resources and trade opportunities. Coastal areas typically have access to the ocean, which can lead to economies based on fishing, maritime trade, and a more diverse cultural exchange due to interactions with other regions through sea routes. In contrast, mountainous regions may have more limited access to external trade routes and resources, resulting in communities that focus on agriculture and self-sufficiency, often fostering a more insular culture. Each geography shapes the lifestyles, economic practices, and social structures of the populations living within these environments.