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.
So would be the conjunction because it is after the comma and brings the sentence together.
