<p><span style="font-size: 13.008px;">After </span><strong style="font-size: 13.008px;">thorough</strong><span style="font-size: 13.008px;"> </span><span style="font-size: 13.008px;">consideration, we are unable to accept your proposal.</span><br></p><div><strong style="font-size: 13.008px;">Answer:</strong><span style="font-size: 13.008px;"> (C) thorough</span><div style="font-size: 13.008px;"><br><div>In this sentence, we need an adjective to describe the type of consideration that was given. The correct word to use is "thorough," which means complete or careful. </div><div>(A) "through" is a preposition and does not fit in the context of the sentence. <span style="font-size: 13.008px;"> </span><span style="font-size: 13.008px;">"through" means by means of or by way of.</span></div><div>(B) "throughout" is also a preposition and does not describe the type of consideration given. "<span style="font-size: 13.008px;">throughout" means in every part of or during the whole time.</span></div><div>(D) "thought" is a noun or <span style="font-size: 13.008px;">the past tense of the verb "think"</span><span style="font-size: 13.008px;"> and does not function as an adjective in this sentence. </span></div><div><br></div><div>Therefore, the correct answer is (C) "thorough."</div></div></div>