Answer:
The answer is your first option: <u>If a true utopia can ever be achieved, everyone must share the same vision and be willing to act for the common
</u>
<u>good.</u>
Explanation:
The second and third option aren't the strongest choice for an essay explaining the writer's vision of a utopia, as the third option explains how he prepared his text and well the answer is:<em> by presenting many characteristics, </em>this doesn't give us any writer's vision at all, only a structure of his text. The second option, although it is indeed presenting the writer's vision, it isn't the strongest, for it only presents three limited and specified reasons; whereas, the first option, presents two visions, but they're not limited as sharing the same vision implies many things, acting for the common good too, for instance; giving shelter to the less fortunates in cold weather, feeding people on Thanksgiving, donating clothes, etc, etc... So this is the reson why this is the strongest choice.