<p dir="ltr">Let's analyze the sentence:<br></p><p><strong>The supervisor reminds the staff [that (____ is discussed at the meeting) is confidential and should be revealed to anyone (who is not in the company)].</strong><span> </span></p><p>The part wrapped with "[]" is a noun clause. The part wrapped with "()" is an adjective clause.</p><p>Now, look at this part:</p><p><span>“________ is discussed at the meeting is confidential.”</span></p><p>What's missing here is a subject.</p><p><span>Among all the four choices, only (A) </span><span>whichever</span><span> and (B) </span><span>whatever</span><span> are possible answers since they are both compound relative pronouns which can be seen as a noun to serve as the subject of a sentence. (C) </span><span>whenever</span><span> and (D) </span><span>wherever</span><span> are incorrect because they are compound relative adverbs, not nouns. </span></p><p><span>Based on the meaning of the context, the correct answer should be (B) </span><span>whatever</span><span>, which means “anything that”</span><span>. So, "anything that is discussed at the meeting is confidential".</span><br></p><p dir="ltr"><span><span>(A) </span><span>whichever</span><span> - "whichever" means “any one of them that”. It is </span></span>used when there are specific choices, but this is not the case in this question since no specific topics being discussed are mentioned in the context. </p>