Answer: I would contend that the right answer is the B) Service is helping other people and being active in your community.
Explanation: Just to elaborate a little on the answer, it can be added that this initial statement represents the main idea of the paragraph, which then introduces an example of service — specifically the creation and regular maintenance of a garden by a group of teenagers, who donate what they grow to a local soup kitchen, and, by doing so, help some of the members of their community and are active in that community.