<div><span style="color: rgb(62, 62, 62);">We can read this question sentence as:</span><br></div><div><p>"<strong>Because the strategy was proposed by the well-renowned expert in this field, </strong><strong>the strategy was immediately adopted by the chief executive and was soon implemented</strong>."</p><p>This sentence is a complex sentence with a main clause and an adverbial clause. <span>The adverbial clause is "Because the strategy was proposed by the well-renowned expert in this field." The main clause is "the strategy was immediately adopted by the chief executive and was soon implemented." </span></p><p><font color="" face=""><span>An adverb clause can be reduced to an adverbial phrase by removing the subject and the be-verb when they are not essential to the meaning of the sentence.</span></font></p></div><div><p>Here's a step-by-step breakdown:</p><ol><li><p><strong>Identify the Subject and Verb in the Adverb Clause</strong>: The subject is "the strategy" and the verb is "was proposed."</p></li><li><p><strong>Identify Redundancy</strong>: In the main clause, "the strategy" is also the subject. So, when reducing the adverb clause, the subject "the strategy" in the adverb clause is redundant and can be omitted.</p></li><li><p><strong>Change the Verb</strong>: The verb "was proposed" should be transformed into its past participle form "proposed" to create an adverbial phrase.</p></li><li><p><strong>Omit the Subordinating Conjunction</strong>: The subordinating conjunction "Because" is also often omitted when the adverb clause is reduced to a modifying phrase.</p></li></ol><p>Resulting Adverbial Phrase: "Proposed by the well-renowned expert in this field"</p><p>Therefore, the correct answer is (B) "Proposed".</p></div>