D. It contains background information about the Nature Center that a general audience would need.
The opening paragraph tells the audience why the Nature Center was founded and what it has to offer the visitors and community. It then transitions to how the Nature Center is funded and the annual fundraiser. The background information about the purpose of the Nature Center and it's offerings give the necessary information the general audience would need to get interested in supporting the fundraiser. There is no language to suggest the audience is officially connected to the Nature Center. It also does not assume the audience already knows a lot about the Nature Center. The paragraph includes only the basic information a person who was familiar with the Nature Center would already know. It also does not assume the audience can effect big changes. It hope the audience may be interested in participating in the fundraiser, but does assume a big change.