<p>The new sales agent solved the customer complaint by <strong>promptly</strong> offering a full refund for the damaged goods.</p>
<p><span style="font-size: 13.008px;">In this sentence, we are looking for an adverb that describes how the new sales agent solved the customer complaint. The phrase "by offering a full refund for the damaged goods" tells us that the sales agent solved the complaint by taking a specific action.</span><br></p>
<p>Let's examine each option:</p>
<p>(A) <strong>potentially</strong>: This adverb means that something is possible or could happen, but it does not fit the context of the sentence. The sales agent actually took action to solve the complaint, so "potentially" does not accurately describe how the agent resolved the issue.</p>
<p>(B) <strong>tediously</strong>: This adverb means that something is done in a slow, boring, or laborious manner. While it is possible that solving a customer complaint could be a tedious process, there is no indication in the sentence that the sales agent took a long time or did the task in a boring manner. Therefore, "tediously" does not accurately describe how the agent resolved the issue.</p>
<p>(C) <strong>promptly</strong>: This adverb means that something is done without delay or quickly. This is the correct answer choice because it accurately describes how the sales agent solved the customer complaint. By offering a full refund for the damaged goods promptly, the agent took swift action to address the issue.</p>
<p>(D) <strong>rarely</strong>: This adverb means that something happens infrequently or seldom. This does not fit the context of the sentence because the sales agent resolved the complaint by offering a full refund, indicating that this action is not rare or infrequent.</p>
<p>Therefore, the correct answer is <strong>(C) promptly</strong>.</p>