The correct answer is option 1 - 1, 2 and 3.

Option 1 states that the theme for the year 2011 for the United Nations Environment Programme (UNEP) is `Forest: Nature at Your Service`. This is correct as the UNEP does indeed have different themes for each year, and in 2011, the theme was focused on forests.

Option 2 states that the UNEP underscores the link between quality of life and health and the forest ecosystem. This is also correct as the UNEP recognizes the importance of forests in providing various ecosystem services, including the improvement of air and water quality, provision of food, medicine, and other resources, and support for biodiversity, which ultimately contributes to human health and well-being.

Option 3 states that India is declared as a global host of World Environment Day 2011. This is also correct as World Environment Day is an annual event organized by the UNEP, and in 2011, India was indeed declared as the global host country for the celebrations.

In summary, all three statements provided in option 1 are correct and accurately describe the United Nations Environment Programme (UNEP).