The correct answer is ecotourism. Ecotourism is a form of tourism that involves visiting natural areas to learn about and appreciate the environment. It is a responsible form of tourism that minimizes negative impacts on the environment.
Mass tourism is a form of tourism that involves large numbers of people traveling to the same destination at the same time. It can have a negative impact on the environment, as it can lead to overcrowding, pollution, and damage to natural resources.
Adventure tourism is a form of tourism that involves activities that are challenging and exciting, such as hiking, climbing, and skiing. It can be a dangerous form of tourism, and it can also have a negative impact on the environment.
Religious tourism is a form of tourism that involves visiting places of religious significance. It can be a peaceful and respectful form of tourism, but it can also lead to overcrowding and damage to religious sites.
In conclusion, ecotourism is the most responsible form of tourism, as it minimizes negative impacts on the environment.