<p dir="ltr">Let's analyze the sentence:<br></p><p><strong>Workers in the warehouse are reminded {that [____ exits the warehouse last] needs to lock the main entrance door and turn on the alarm system}.</strong><span> </span></p><p>The part wrapped with "{}" is the outlayer noun clause. The part wrapped with "[]" is the interlayer noun clause.</p><p>In the noun clause "____ exits the warehouse last", it is missing a subject.</p><p>The correct answer is (D) whoever. </p><p>The word "whoever" is used as a subject pronoun. It is used to refer to any person who exits the warehouse last. The word "whoever" is used here because we are talking about an unknown person or any person in general, rather than a specific person.</p><p>(A) anyone - This is incorrect because it is used as an object pronoun. It is used to refer to any person, but it does not work as the subject of the sentence.</p><p>(B) someone - This is also incorrect because it is used as an object pronoun. It is used to refer to a specific person, but in this sentence, we are talking about any person who exits the warehouse last, not a specific person.</p><p>(C) whomever - The word "whomever" is incorrect because it is used as an object pronoun. It is used to refer to the object of a verb or preposition. In this sentence, we need a subject pronoun to refer to the person who exits the warehouse last.</p><p>Therefore, the correct answer is (D) whoever</p><p></p>