Final answer:
Visitors to another country should indeed respect the local environment, and they should also respect the local customs is true due to principles of ecotourism and geo-tourism. So, the correct option is 1.
Step-by-step explanation:
This principle is closely related to the practices of ecotourism, which is a sustainable form of tourism aimed at minimizing environmental impact while respecting the local culture and supporting the well-being of local people.
Ecotourism requires careful management so that the influx of tourists and the business interests of local entrepreneurs do not damage the delicate ecosystems or cultural integrity that attract travellers in the first place. For instance, sites like the Galapagos Islands and Machu Picchu must manage tourist activities meticulously to prevent degradation and preserve their unique environments and cultural heritage.
Additionally, sustainable practices align with the aims of geo-tourism, which focuses on stewardship and maintaining the essential character of a place.
Therefore, 1) True is the correct option.