The thesis is usually at the beginning of the essay. It states what you will talk about in the essay. It's kind of like a preview.
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.
Tree branch
hope this helps :D
Stefan didn't like the choices of books to read, so he spoke with his teacher about an ________ choice.
Which word best completes the sentence?
alternative