The stylistic element used in the passage is incongruity. It is a form of satire or humor. Incongruity is used in an unsuitable time. For example, If a man were in a court room and belched loudly while receiving his sentence, that would be a use of incongruity. Another example would be if at a royal wedding the groom's pants fell down in the middle of the ceremony.
The right answer for the question that is being asked and shown above is that: "The main idea of the paragraph is this - <span>Volunteering is a good way to gain skills and work experience." It serves as the summary of the whole paragraph and catches the whole thought.</span>
