Well definitions can help a lot. I’m not completely sure though
The best and most correct answer among the choices provided by your question is the third choice.
<span>The Statements, "and the sooner the better!" and "it has to be!" from "All watched over by Machines of Loving Grace" develop the speaker as being urgent.</span>
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First of all, it is important to define preposition phrase in order to find it in this sentence. We can say that "<span>a prepositional phrase will begin with a </span>preposition<span> and will end with a </span>noun<span>, </span>pronoun<span>, </span>gerund<span>, or </span>clause<span>, the "object" of the preposition"
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*In this case, we find UNTIL TODAY as the only prepositional phrase presented. until is the preposition and today is the noun.