Answer:
The answer is: <em>Overall, Schwartz's claim that recycled water faces a public image challenge is well argued and supported with strong evidence.</em>
Explanation:
When making an effective concluding statement, it is very important to wrap things up. It means you need to summarize the points you've mentioned in your essay or article. You can also use words such as: <em>Thus, Therefore, Overall, Finally, Lastly, In general, As a result, As expressed, In conclusion, For this reason, etc. </em><em>The statement above uses "overall," thus it is the answer.</em>
Remember that you shouldn't start opening a new idea here because it marks the end of your essay. You just have to put everything together and it would also be better if you call for an action or a solution if the topic talks about an issue.
