Answer: Students and staff will be generous because many have personal connections to the people affected by the flood.
Step-by-step explanation:
Since Naomi is listing reasons to support her claim that a school rummage sale should be organized to raise money for people affected by recent flooding, the best reason to include to support her argument is that "Students and staff will be generous because many have personal connections to the people affected by the flood".
When people have person connections with others, they tend to care about them and seek to help them when they're in need. Therefore, making the claim that students and staff have personal connections with those affected by the flood will help support her claim that a school rummage sale should be organized to raise money for those affected.
Therefore, the correct option is A.