A One possible example is that clubs could set up tables with project samples, meeting times, and current members ready to answer questions. The example is interesting and related to the topic. Because it is an example, the paragraph is already developed enough.
B The strongest reason to support creating lunchtime club fairs is that it would help more students discover activities they might join. Consider that clubs could set up tables with project samples, meeting times, and current members ready to answer questions. Because the fair lowers the awkwardness of entering a new activity alone, the change would matter beyond a single convenience. It would show that student involvement grows when opportunities are visible and approachable.
C Creating lunchtime club fairs would probably get attention because people like new programs and public announcements. The school or community could put up posters and share photos. Since attention is useful, the claim is fully supported.
D Creating lunchtime club fairs should be supported because the claim is strong. It would help more students discover activities they might join. Since strong claims make strong essays, this paragraph proves the point.