Answer:
A. key points
Explanation:
a summary is for the audience to quickly grasp the entire article/story/passage(etc.), it should be short and sweet, consisting only of the key points. your personal opinions are not required. background information is unessential, because it would cause your summary to be too long, and summaries are meant to be short so as to bring out the main topics only, not cover the entire passage. minor examples are optional to include, but not needed as well.
The correct option is "Volunteering is a good way to make friends, help the community, and feel good."
Parallelism is achieved when the same grammar pattern is used when listing ideas. In this example, the parallel structures are "make friends, help the community and feel good" since they all use the same grammar structure: verb+object.
In the rest of the options, there is a break in the pattern so no parallelism is achived.
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